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Caterpillar C18 Engine

The Caterpillar C18 is a 18.1 L 6-cylinder ataac engine rated at 1800 rpm. It powers generator sets from Caterpillar, including the C18 Diesel Oilfield Generator Set, C18-20' XQ600 and D600 GC. It holds 20.8 L (5.5 gal) of oil and 20.8 L (5.5 gal) of coolant.

Also known as: Caterpillar C18, C18

Part of the Caterpillar C18 engine family — 3 variants share parts & fitment.

18.1 L

Displacement

Cylinders

1800 rpm

Rated speed

20.8 L

Oil capacity

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Procedures Wiring

Engine specifications

Oil capacity	20.8 L
Coolant capacity	20.8 L
Displacement	18.1 L
Cylinders	6
Aspiration	ATAAC
Rated speed	1800 rpm

Generator sets powered by this engine

Caterpillar C18 Caterpillar C18 Diesel Oilfield Generator SetCaterpillar C18-20' XQ600Caterpillar D600 GC Caterpillar XQ570

How to read your Caterpillar engine serial & model number →

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	Dual element air cleaner		—	200 hr
Fuel filter	Primary fuel filter with integral water separator, Secondary fuel filters		—	200 hr
Oil filter	Lubricating oil and filter		—	200 hr
Battery	Batteries with rack and cables		—	200 hr
Belt	Fan and belt guards, Belt		—	200 hr
Coolant	Caterpillar Extended Life Coolant	3000.0 l	—
Coolant filter			—
Oil	Lubricating oil and filter	20.8 l	—
Spark plug	Spark Plug		—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

Item	Action	Hours	Months	Notes
Engine oil (S-O-S oil sample)	Test	125 hr		Severe service occurs at high loads, in high temperatures, and in dusty conditions
Coolant (S-O-S coolant analysis Level 1)	Test	250 hr		Cat ELC - Every 250 Hours; also the recommended sampling interval for all conventional heavy-duty coolant/antifreeze and for commercial coolants that meet Cat EC-1
Engine crankcase oil (S-O-S oil sample)	Test	250 hr		Table 6 S-O-S Oil Sampling Interval; severe applications may require a more frequent oil sampling interval
Primary air filter element	Change	250 hr		When changing the primary element at 250 operating hours (basis of the without-indicator filter-change comparison)
SCA (Supplemental Coolant Additive) concentration	Test	250 hr		Test the concentration of SCA or submit a coolant sample at 250 hour intervals or at PM Level 1 intervals; check at every oil change or every 250 hours, whichever occurs first
Coolant (S-O-S coolant analysis Level 2)	Test	500 hr	12 mo	First service — For new systems, refilled systems, and converted systems that use Cat ELC or Cat DEAC; also every year; use the interval that occurs first
oil	Change	500 hr		3000 Series service intervals increased to 500 hours as standard (3013C, 3024C, 3054, 3056)
Secondary air filter element	Change	750 hr		When changing the secondary element at 750 operating hours (basis of the without-indicator filter-change comparison)
Cat ELC Extender addition (cooling system)	Other	6000 hr		Treat the cooling system with Cat ELC Extender at 6000 hours or one half of the coolant service life
Coolant (Cat ELC)	Change	12000 hr		12000 service hours or six years; use the interval that occurs first
minor overhaul	Other	20000 hr		3600 engines designed to run 20 000 hours between minor overhauls using No. 2 fuel
major overhaul	Other	40000 hr		3600 engines designed to run 40 000 hours between major overhauls using No. 2 fuel
cylinder liners and pistons	Other	80000 hr		3600 cylinder liners and pistons designed for 80 000 hours using No. 2 fuel
Coolant (S-O-S coolant analysis Level 1 and Level 2)	Test		12 mo	Cat DEAC - Yearly

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Cylinder bore diameter	5.4	IN
Clearance	Piston stroke	6.7	IN
Other	Combustion air inlet flow rate	38.2	m3/min
Other	Excitation ceiling	adjustable at 3 points		by configuration
Other	Field excitation current	0-5	A	rated; short-circuit 10A max
Other	Frequency range	10-100	Hz
Other	Gross Input Torque (TH55-E70)	12 667	N•m (9350 lb-ft)
Other	Gross Input Torque (TH55-E90)	12 677	N•m (9350 lb-ft)
Other	Maximum fuel flow from transfer pump to engine	69.2	G/HR
Other	Maximum transfer pump priming lift without priming pump	12.1	FT
Other	Maximum uninterrupted fill rate	5.0	G/MIN
Other	Quadrature droop adjustment range	-20 to 20	%
Other	Radiator air flow	720	m3/min
Other	Radiator cooling package design ambient temperature	48.9	°C (120° F)	with 50/50 water/Extended Life Coolant mixture
Other	Radiator cooling package maximum elevation	1524	m (5000 ft)	with 50/50 water/Extended Life Coolant mixture
Other	Regulation accuracy	+/-0.25	%	of the average of the three phases on a linear load, with harmonic distortion less than 5%
Other	Stall Torque Ratio (TH55-E70)	2.23
Other	Stall Torque Ratio (TH55-E90)	2.23
Other	Stator current measurement range	0-1 or 0-5	A
Other	Total cylinder displacement	928	CU IN
Other	Under frequency slope	0.5 to 3	V/Hz	adjustable in steps of 0.1 V/Hz
Pressure	Exhaust system backpressure (maximum allowable)	10.0	kPa
Pressure	Maximum allowable fuel return line restriction	14.8	in-HG
Pressure	Maximum allowable fuel supply line restriction	8.0	in-HG
Pressure	Maximum allowable intake restriction with clean element	15	in-H2O
Pressure	Maximum allowable intake restriction with dirty element	25	in-H2O
Pressure	Maximum allowable system back pressure	40	in-H2O
Pressure	Maximum pressure drop from compressor outlet to manifold inlet (or mixer inlet for EGR)	4.4	in-HG
Pressure	Normal fuel pressure in a clean system	90.1	PSI
Pressure	Oil pressure	65-69		at 600 kW load
Pressure	Radiator air flow restriction (system)	0.12	kPa
Pressure	Unit injector fuel injection pressure	1240	bar (18 000 psi)
Pressure	WS255 pump plunger load	238,000	lb (107,960 kg)
Pressure	WS273XD pump plunger load	275,000	lb (124 738 kg)
Pressure	WS305XD pump plunger load	250,000	lb (113 398 kg)
Resistance	Field winding resistance	>4	ohms
Speed	Frequency	60	Hz
Speed	Maximum Input Speed (TH55-E70/TH55-E90 transmissions)	1970	rpm
Speed	Minimum cranking speed required for start	115	RPM
Speed	Rated Input Speed (TH55-E70/TH55-E90 transmissions)	1900	rpm
Temperature	Ambient operating temperature	-40 to +65	°C
Temperature	Ambient temperature	65-66	°F
Temperature	Coolant temperature	189-190	°F	at 600 kW load
Temperature	Exhaust stack gas temperature	531.1	deg C
Temperature	Lowest ambient start temperature without aids	32	deg F
Temperature	Max. allowable combustion air inlet temperature	49	deg C
Temperature	Maximum allowable fuel temperature at engine outlet	225	deg F
Temperature	Maximum allowable fuel temperature at transfer pump inlet	140	deg F
Temperature	Maximum allowable jacket water outlet temperature	219	deg F
Temperature	Radiator DELTA-T	38	D
Torque	Air compressor SAE "A" hydraulic pump drive maximum torque (374 L/min and 467 L/min compressors)	60	N•m (44 lb-ft)	C7, C9 ACERT
Voltage	Alternator voltage sensing	0-530	VAC	three-phase range
Voltage	DC voltage	27.1	V
Voltage	Power supply voltage range	50-277	VAC
Voltage	Voltage adjustment range	0 to 150	% of rated voltage
Voltage	Voltage level adjustment	+/-5.0	%
Voltage	Voltage regulation, steady state	+/-1.0	%

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Notes
Coolant	50/50 mixture water/Caterpillar Extended Life Coolant		below 48°C	Radiator cooling packages designed for up to 48.9° C (120° F) ambient; coolant sump refill capacities vary by oil sump/pan (18 L to 106 L service refill with new oil filter change)
Coolant	Cat DEAC			Diesel; 3,000 Service Hours or Three Years; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat DEAC (Diesel Engine Antifreeze/Coolant)	Acceptable coolant; commercial heavy-duty antifreeze/coolant must meet ASTM D4985 or ASTM D6210		Conventional heavy-duty coolant/antifreeze. Caterpillar recommends a 1:1 mixture of water and glycol. Do not use a commercial coolant/antifreeze that only meets the ASTM D3306 specification. Do not use Cat SCA at the initial fill when Cat DEAC is used.
Coolant	Cat ELC			Diesel; 12,000 Service Hours or Six Years; add Cat ELC Extender at 6,000 service hours or one half of service life; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat ELC (Extended Life Coolant)	Caterpillar EC-1 specification (preferred); also meets ASTM D4985, ASTM D6210, and ASTM D3306		Service life of 12000 service hours or six years. Premixed ELC provides freeze protection to -37 C (-34 F); ELC Concentrate can be used to lower the freezing point to -52 C (-62 F). An Extender is the only additional maintenance needed at 6000 service hours or one half of the ELC service life. Cat ELC cooling systems can withstand contamination to a maximum of ten percent of conventional heavy-duty coolant/antifreeze and/or SCA.
Coolant	Cat NGEC			Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first
Coolant	Cat SCA (Supplemental Coolant Additive) with water			SCA concentration in a cooling system that uses SCA and water should be six to eight percent by volume; do not exceed the eight percent maximum concentration. If Cat SCA is not used, the commercial SCA must provide a minimum of 2400 mg/L or 2400 ppm (140 grains/US gal) of nitrites in the final coolant mixture when used with water, and a minimum of 1400 mg/L or 1400 ppm (82 grains/US gal) with heavy-duty coolant/antifreeze.
Coolant	Glycol (ethylene glycol / propylene glycol)	Propylene glycol coolant must meet ASTM D6210-04		Ethylene glycol: 50 percent = freeze protection -37 C (-34 F), boil protection 106 C (223 F); 60 percent = -52 C (-62 F), 111 C (232 F). Propylene glycol: 50 percent = -32 C (-26 F), 106 C (223 F). Do not use propylene glycol in concentrations that exceed 50 percent; do not use ethylene glycol in concentrations that exceed 60 percent. All Caterpillar diesel engines equipped with air-to-air aftercooling (ATAAC) require a minimum of 30 percent glycol.
Engine oil	Cat DEO (Diesel Engine Oil) 10W-30 and 15W-40	Cat ECF-1 (exceeds); API CI-4, API CI-4 PLUS, API CH-4, API CG-4, API CF (Cat DEO SAE 15W-40)		Caterpillar oils are used to fill diesel engines at the factory. Non-Caterpillar commercial oils are second choice oils. Do not use API CF-4 oils in Caterpillar diesel engines. Do not use single grade API CF oils or multigrade API CF oils in 3500 Series, C175 Series and smaller DI diesel engines.
Engine oil	Cat NGEO			Natural Gas
Engine oil	Commercial oils (DI engines)	Cat ECF-1 required; API CG-4 multigrade acceptable; API CH-4, API CI-4 and API CI-4 PLUS acceptable only if the requirements of Cat ECF-1 are met; do not use API CF-4 oils		Minimum TBN must be 10 times the fuel sulfur level (ASTM D2896); minimum TBN of the oil is 5 regardless of a low fuel sulfur level. API CG-4 oils: do not exceed the standard oil drain interval.
Engine oil	Commercial oils (PC engines)	Cat ECF-1; API CH-4, API CI-4, API CI-4 PLUS (if Cat ECF-1 requirements met); API CG-4 multigrade; API CF-4 multigrade; API CF		Minimum TBN of the oil that is used in PC engines must be 20 times the fuel sulfur level; minimum TBN of new oil is five. Change the oil when the TBN deteriorates to 50 percent of the original TBN.
Engine oil	Re-refined base stock oils			Acceptable if they meet the performance requirements specified by Caterpillar; filtering is inadequate for producing high quality re-refined base stock oils.
Engine oil	Synthetic base stock oils			Acceptable if they meet the performance requirements specified for the engine compartment. Caterpillar does not recommend the automatic extension of oil drain intervals for any type of oil.
Engine oil	Cat Arctic DEO SYN SAE 0W-30		-40°C to 30°C	Engine Crankcase; Industrial Engines
Engine oil	SAE 0W-20		-40°C to 10°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	SAE 0W-30		-40°C to 30°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	SAE 0W-40		-40°C to 40°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	Cat DEO SYN SAE 5W-40		-30°C to 50°C	Engine Crankcase; Industrial Engines
Engine oil	SAE 5W-30		-30°C to 30°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	SAE 5W-40		-30°C to 50°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	Cat DEO SAE 10W-30		-18°C to 40°C	Engine Crankcase; Industrial Engines
Engine oil	SAE 10W-30		-18°C to 40°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines); SAE 10W-30 is the preferred viscosity grade for the 3116, 3126, C7, C-9 and C9 diesel engines between -18 C (0 F) and 40 C (104 F)
Engine oil	SAE 10W-40		-18°C to 50°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	Cat DEO SAE 15W-40		-9°C to 50°C	Engine Crankcase; Industrial Engines
Engine oil	SAE 15W-40		-9°C to 50°C	Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	Cat SAEO SAE 30	API CF-4 category	0°C to 40°C	Table 2 - 3116 and 3126 Marine Engines with mechanical unit injection; factory fill has API CF-4 category and viscosity grade of SAE 30
Engine oil	SAE 30		0°C to 40°C	Table 3 Lubricant Viscosities for Ambient Temperatures - PC engines only
Engine oil	Cat SAEO SAE 40	API CF-4 category	5°C to 50°C	Table 2 - 3116 and 3126 Marine Engines with mechanical unit injection. Caterpillar does not recommend the use of multigrade oils in the 3116 and 3126 Marine Diesel Engines that use mechanical unit injection.
Engine oil	SAE 40		5°C to 50°C	Table 3 Lubricant Viscosities for Ambient Temperatures - PC engines only

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Determining the cause of a plugged fuel filter (ice or wax) diagnostic

Remove the fuel filters.
Cut the fuel filters open.
Inspect the fuel filter before the filter warms. The inspection will show that the filter is filled with particles of either ice or wax.

Changing to Cat ELC maintenance

⚠ Do not leave an empty SCA maintenance element on a system that is filled with ELC. The element housing may corrode and leak causing an engine failure.

⚠ Improper or incomplete rinsing of the cooling system can result in damage to copper and other metal components.

⚠ The cooling system cleaner must be thoroughly flushed from the cooling system. Cooling system cleaner that is left in the system will contaminate the coolant. The cleaner may also corrode the cooling system.

Tools: Caterpillar cleaner for cooling systems, 5P-3413 Pipe Sealant, Suitable containers to collect fluids

Drain the coolant into a suitable container.
Dispose of the coolant according to local regulations.
If equipped, remove the empty SCA maintenance element and the element base. Plug the coolant lines or bypass the coolant lines.
Flush the system with clean water in order to remove any debris.
Use Caterpillar cleaner for cooling systems in order to clean the system. Follow the instructions on the label.
Drain the cleaner into a suitable container. Flush the cooling system with clean water.
In systems with heavy deposits, disconnect the hoses. Clean deposits and debris from the hoses and fittings. Install the hoses and tighten the hose fittings.
Fill the cooling system with clean water and operate the engine until the engine is warmed to 49 C to 66 C (120 F to 151 F).
Drain the cooling system into a suitable container and flush the cooling system with clean water.
Repeat Steps 8 and 9 until the system is completely clean.
Fill the cooling system with the Cat ELC.
Operate the engine until the engine is warmed. While the engine is running, inspect the engine for leaks. Tighten hose clamps and connections in order to stop any leaks.
Attach the Special Publication, PEEP5027, "Label" to the cooling system filler for the engine in order to indicate the use of Cat ELC.

Calculating the amount of lighter fuel required to modify the cloud point or the pour point operation

Obtain the specification for the cloud point or the pour point of both fuels from your fuel supplier.
Locate the cloud point or the pour point of the heavier fuel on the left side of the table. Mark the point on the table.
Locate the cloud point or the pour point of the lighter fuel on the right side of the table. Mark the point on the table.
Draw a line between the two points that were established. Label this line "A".
Find the lowest outside temperature for machine operation on the left side of the table. Draw a horizontal line from this point until it intersects line "A". Label this new line "C".
Mark the intersection of line "C" and line "A". Draw a vertical line to the bottom of the table. Label this line "B". The point at the bottom of line "B" reveals the percentage of lighter fuel that is

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Phase	Connection	Notes
3	3 Phase Star (6 Wire)	Standard connection
3	Parallel Star (12 Wire)
3	Series Star (12 Wire)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Caterpillar C18 family

103

Part #	Description	Category
106-3973	Air filter inner	Air filter
151-7737	Air Primary	Air filter
189-0202	Air Secondary	Air filter
1W-3636	Air Secondary	Air filter
1W-3637	Air Primary	Air filter
246-5009	Air	Air filter
246-5010	Air	Air filter
4N0015	Air filter outer	Air filter
7C-1571	Air Primary	Air filter
8N6309	Air filter outer	Air filter
9Y-3879	Air	Air filter
6T1395	Alternator	Alternator
118-2018	V-belt	Belt
4N6302	V-belt	Belt
M-CK3687817P	Cylinder Kit	Cylinder kit
133-5673	Fuel/Water Separator	Fuel filter
1R-0749	Fuel Secondary - ADV	Fuel filter
1R-0762	Fuel Secondary - ADV	Fuel filter
1R-0770	Fuel/Water Separator	Fuel filter
1R-0781	Fuel/Water Separator - ADV	Fuel filter
1R0749	Filter fuel	Fuel filter
1R0755	Filter fuel	Fuel filter
326-1641	Axial seal FWS	Fuel filter
326-1642	Filter water separator	Fuel filter
326-1643	Filter water separator	Fuel filter
3S3875	Filter fuel	Fuel filter
9N3717	Filter water separator	Fuel filter
4N1151	Gasket oil pan	Gasket
M-4220925	Gasket Set - Rear Structure	Gasket
M-4337629	Gasket Set - Rear Structure	Gasket
M-4351087	Gasket Set - Rear Structure	Gasket
M-4361559	Gasket Set - Front Structure	Gasket
M-4365757	Gasket Set - Turbo Installation	Gasket
M-4452666	Gasket Set - Rear Structure	Gasket
M-4496052	Gasket Set - Oil Cooler & Lines	Gasket
M-4588198	Gasket Set - Front Structure	Gasket
M-4682161	Gasket Set - Cylinder Head	Gasket
M-4685553	Gasket Set - Central & Lower	Gasket
M-4685746	Gasket Set - Cylinder Head	Gasket
M-4687363	Gasket Set - Water Pump	Gasket
M-4687942	Gasket Set - Turbo Installation	Gasket
M-4690626	Gasket Set - Central & Lower	Gasket
M-4690822	Gasket Set - Turbo Installation	Gasket
M-4690823	Gasket Set - Cylinder Head	Gasket
M-4690878	Gasket Set - Cylinder Head	Gasket
M-4692381	Gasket Set - Central & Lower	Gasket
M-4692382	Gasket Set - Fuel System	Gasket
M-4692388	Gasket Set - Cylinder Head	Gasket
M-4701892	Gasket Set - Turbo Installation	Gasket
M-4733264	Gasket Set - Rear Structure	Gasket
M-4886213	Gasket Set - Oil Cooler	Gasket
M-4916359	Gasket Set - Turbo Installation	Gasket
MCB3306031	MAJOR OVERHAUL GASKET SET	Gasket
MCB3306032	GASKET SET	Gasket
MCB3306033	CYLINDER HEAD GASKET SET	Gasket
MCB3306121	MAJOR OVERHAUL GASKET SET	Gasket
MCB3306122	GASKET SET	Gasket
MCB3306123	CYLINDER HEAD GASKET SET	Gasket
M-2572752	Gasket Set - C18 Front Structure	Gasket set
M-3604170	Gasket Set - C18 Front Structure	Gasket set
M-3605916	Gasket Set - C18 Central & Lower	Gasket set
M-4154993	Gasket Set - Single Cylinder Head - C18	Gasket set
M-4446485	Gasket Set - C13-C15-C18 Front Structure	Gasket set
126-1815	Hydraulic - UHE	Hydraulic filter
144-6691	Hydraulic	Hydraulic filter
1R0774	Filter hydraulic	Hydraulic filter
328-3655	Filter hydraulic/transmission	Hydraulic filter
9T0973	Filter hydraulic/transmission	Hydraulic filter
M-2463129	Impeller – Water Pump	Impeller
102-2828	Filter oil	Oil filter
1R-0716	Engine Oil	Oil filter
1R-1808	Engine Oil - ADV	Oil filter
1R0716	Filter oil	Oil filter
1R1808	Filter oil	Oil filter
2243245	Connecting rod	Service part / kit
249-0439	Oxidation Catalyst Assembly - Round	Service part / kit
256-0331	Oxidation Catalyst Assembly - Round	Service part / kit
888-983-7847	ENGINE BLOCK CRANKSHAFT	Service part / kit
A100	Download Specification	Service part / kit
M-3687815	Piston	Service part / kit
M-3687816	Piston	Service part / kit
M-CK3687815P	Kit - Cylinder Kit	Service part / kit
M-CK3687816P	Kit - Cylinder Kit	Service part / kit
R-20R2284	C15/C18/C27/C32 ACERT Trim file (12-digit serial)	Service part / kit
R-20R2285	C15/C18/C27/C32 ACERT Trim file (12-digit serial)	Service part / kit
RSC18E	Ring Set - Piston	Service part / kit
RSC18E1	Ring Set - Piston	Service part / kit
M-3687817	Piston	Piston
138-6744	Water pump repair kit	Pump
161-4113	Oil pump	Pump
336-2213	Water pump	Pump
352-0211	Water pump	Pump
384-8611	Lift/transfer pump	Pump
384-8612	Lift/transfer pump	Pump
M-2463130	Shaft – Water Pump	Pump
M-2672839	Water pump repair kit	Pump
M-3848611	Pump - Transfer	Pump
142-5867	Front seal	Seal
142-5868	Rear seal	Seal
M-2454630	Sensor Assembly - Speed	Sensor
247-7133	Thermostat	Thermostat
248-5513	Thermostat	Thermostat
420-5855	Water Pump Seal Installer (Dimensions: 47 x 45 mm, Weight: .463 kg)	Water pump seal installer

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Aftermarket parts that fit this engine

240A FridayParts $34.29 366-0669 FridayParts $356.99 20R-0956 FridayParts $356.99 171-2212 FridayParts $75.99 265-8713 FridayParts $50.40 3524700 FridayParts $266.20 235-7132 FridayParts $255.60 7G-7889 FridayParts $187.20 SinoCMP $329.00 344-5081 FridayParts $53.50 485-9753 FridayParts $479.63 20R-4050 FridayParts $625.60 591-2386 FridayParts $625.60 398-4747 FridayParts $625.60 344-3456 FridayParts $121.60 344-3455 FridayParts $121.60 201-0950 FridayParts $94.30 252-2237 FridayParts $108.20 153-2521 FridayParts $39.50 219-6488 FridayParts $57.90 335-7371 FridayParts $328.59 518-6322 FridayParts $732.56 335-7370 FridayParts $328.59 353-2833 FridayParts $96.56 3E-6466 FridayParts $73.99 162-2073 FridayParts $73.99 096-1628 FridayParts $48.56 5P-8309 FridayParts $48.90 3E-0156 FridayParts $15.78 SinoCMP $29.00 118-6606 FridayParts $104.45 369-8502 KuduParts $350.00 FridayParts $359.99 247-7133 Amazon eBay $107.00 eBay $41.00 FridayParts $27.50 217-6022 FridayParts $385.56 5P-4924 FridayParts $29.50 171-2211 FridayParts $81.88 SDLM-90-4 FridayParts $81.88 396-6886 FridayParts $506.47 342-8127 FridayParts $285.99 5C-8964 FridayParts $30.99 5C-9029 FridayParts $30.99 327-6125 FridayParts $63.24 327-8515 FridayParts $63.24 122-6585 FridayParts $123.56 148-8385 FridayParts $10.80 150-4037 FridayParts $27.42 261-6847 FridayParts $112.35 3B-6552 FridayParts $7.51 326-7963 FridayParts $48.20 10R-6317 FridayParts $1091.84 440-1616 FridayParts $1091.84 124-5572 KuduParts $50.00 FridayParts $52.10 189-0202 eBay $60.00 FridayParts $79.99 166-1681 FridayParts $79.99 245-3818 FridayParts $230.99 268-6705 KuduParts $49.00 FridayParts $51.20 331-8111 FridayParts $39.99 6I-0273 FridayParts $62.90 177-7375 FridayParts $75.99 KuduParts $143.00 251-7222 KuduParts $145.00 FridayParts $150.00 CA3731765 FridayParts $148.00 15273424 FridayParts $148.00

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Also used in

Caterpillar 24M — Grader
Caterpillar 385C — Excavator Tracked
Caterpillar 385CL — Excavator Tracked
Caterpillar 385CMHPU — Power Unit
Caterpillar 772 — Dump Truck
Caterpillar 772G — Haul Truck
Caterpillar 834H — Dozer Wheeled
Caterpillar 836H — Compactor
Caterpillar 988H — Loader Wheeled
Caterpillar D9 — Dozer Tracked
New Holland FR9080 — Harvester
Wirtgen W 2100 — Milling Equipment

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

What is the oil capacity of the Caterpillar C18?

The Caterpillar C18 engine has an oil capacity of 20.8 liters.

What is the displacement of the Caterpillar C18?

The Caterpillar C18 has a displacement of 18.1 liters with 6 cylinders.

Which generators use the Caterpillar C18 engine?

The Caterpillar C18 powers 5 generator set(s), including Caterpillar C18, Caterpillar C18 Diesel Oilfield Generator Set, Caterpillar C18-20' XQ600, Caterpillar D600 GC, Caterpillar XQ570.