Recommended Procedure
Check for the correct oil level using the dipstick with the vehicle on level ground.
If the oil level is overfull, it is possible the engine was incorrectly repaired or fuel is diluting the oil and filling the crankcase.
Inspect oil for color. A milky white oil indicates possible coolant contamination which has an ethylene glycol odor.
Oil contaminated with diesel fuel has a diesel fuel odor and increases the engine oil level. If the engine oil level is above Max due to diesel fuel dilution, the oil appears thin and watery.
Check the maintenance records for correct oil type and viscosity for the vehicle operating temperature. Oil that has had extended drain intervals have increased viscosity (become thicker) and makes engine cranking more difficult and starting less reliable at temperatures below freezing. Refer to the lube oil chart in the Workshop article or Owner's Literature for the correct oil selection for temperature conditions.