Mitsubushi — 6 Check the oil pan and other parts for oil leakage. Repair any oil leakage found.

A Mitsubushi service procedure — check it applies to your exact model before use.

Procedure

7 Crank the engine for about 10 seconds or less using the starters, and wait for about 1 minute.
8 Repeat the above cranking operation several times to circulate oil in the engine. To crank the engine, shut off the fuel supply to the engine (keep the control rack of the fuel injection pump in the OFF position) and operate the starters.
9 Check the oil level with the oil level gage again, and add oil if necessary. inspection of Engine Oil for Mixing of Fuel and Water Sample 1 to 2 L [0.26 to 0.53 U. S. gal] of engine oil, and check for abnormal odor and discoloration to deter- mine the mixing of fuel and water. if fuel is mixed with the engine oil, the oil will smell like fuel. If water is mixed with the engine oil, the oil will be milky white. If fuel and/or water is mixed with the engine oil, contact a Mitsubishi dealer. Note: Regarding replenishment of engine oil, refer to "Lubricating System" (3-4). If the engine continues to operate with engine oil mixed with fuel or water, the engine oil viscosity decreases and this can cause serious accidents such as seizing of bearings. If fuel or water is detected in the engine oil, find the cause of the problem, and repair. If the problem cannot be corrected easily, contact a Mitsubishi dealer. Chapter 6 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES Changing Governor Oil Filter To drain oi! or change oil filters, wear gloves. Hot engine oil.and parts may cause burns.
1 Place the oil receiving tray under the governor filter.
2 Loosen the air vent plug and remove the drain plug. Drain oil in the filter.
3 Remove the oil pipe from the center bolt.
4 Remove the center bolt and removet the case from the bracket: Remove the used element from the case.
5 Put a new element in the case using the center bolt.
6 Install the case to the filter bracket. Tighten the center bolt. .
7 Install the oil pipe to the center bolt.
8 Install the drain plug.
9 Remove the air vent plug and fill up the filter with engine oil. Install the air vent plug.
10 After filling oil up; reinstall the air vent plug. Air vent plug Drain plug Oil pipe ee | Element Case ras Center bolt fig.6-13 Changing governor oil filter Chapter 6 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES Cooling System Changing Coolant Remove the radiator cap only after the engine cools to room temperature. Place a cloth over the cap,.and turn the cap about a half turn or stand the lever to upright position to release internal pressure. Opening the radiator cap while the engine is hot causes steam and hot ._ coolant to blow out, resulting in skin burns. Coolant (containing LLC) drained from an engine is toxic, and must not be disposed of into regular sewage. For disposal of used cool- ant, consult a Mitsubishi dealer. The service life of LLC is 2 years. Be sure to change coolant at least once every 2 years. Draining coolant
4 When draining coolant immediately after engine | operation, let the engine idle at low speed for 5 to 6 minutes and lower the coolant temperature

Source: manual:Mitsubishi S12R Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.