Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Engines›Generac 1.5L

Generac 1.5L Engine

The Generac 1.5L is a 1.5 L 4-cylinder naturally aspirated engine rated at 3600 rpm. It powers generator sets from Generac, including the QT020 and QT025. It holds 3.8 L (1.0 gal) of oil and 8.5 L (2.2 gal) of coolant.

Also known as: Generac Power Systems, Inc. 1.5L, 1.5L

1.5 L
Displacement
4
Cylinders
3600 rpm
Rated speed
3.8 L
Oil capacity
On this pageSpecsGenerator setsMaintenanceFAQ

Engine specifications

Oil capacity3.8 L
Coolant capacity8.5 L
Displacement1.5 L
Cylinders4
AspirationNaturally Aspirated
Rated speed3600 rpm

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter59402500 hr Amazon eBay $18.00
Oil filter244-A4531150 hr Amazon eBay
BeltValve Timing199-A4531 Amazon eBay $89.99
Coolant50/50 mixture of low silicate ethylene glycol base anti-freeze and soft water8.5 LITERS—
OilService SC, SD, SE, or SF; SAE 40, SAE 30, SAE 20W, SAE 10W-304.0 U.S. QUARTS—150 hr
Spark plug275-A4531 Amazon eBay $22.57

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

Common questions

What is the oil capacity of the Generac 1.5L?

The Generac 1.5L engine has an oil capacity of 3.8 liters.

What is the displacement of the Generac 1.5L?

The Generac 1.5L has a displacement of 1.5 liters with 4 cylinders.

Which generators use the Generac 1.5L engine?

The Generac 1.5L powers 2 generator set(s), including Generac QT020, Generac QT025.

How often should you change the oil in the Generac 1.5L?

The Generac 1.5L oil change interval is every 150 hours.