2. Check Engine Oil Level

2. CHECK ENGINE OIL LEVEL

WARNING: Smoking or open flame of any type must not be present when working near fuel or fuel vapor. Failure to follow these instructions may result in personal injury.

NOTICE: Only use ultra low sulfur diesel fuel that is 5% or less biodiesel with this vehicle. Use of any other fuel type may damage the vehicle or cause an emission concern. Refer to the Owner's Literature for more information.

NOTE:
- If directed here from a pinpoint test, return to the pinpoint test after carrying out this procedure.
- If the engine oil has diesel fuel contamination, the engine oil appears thin and watery, and has a diesel fuel odor. If the engine oil has coolant contamination, the engine oil appears milky white and has an ethylene glycol odor.

Purpose:
The purpose of this test is to verify the correct engine oil quality and level.

Check Engine Oil Level
- Check for aftermarket performance products.
- Check for contaminants (fuel, coolant).
- Correct grade/viscosity.
- Miles/hours on engine oil, correct level.







Recommended Procedure:
Check for aftermarket performance products. If aftermarket performance products are present, return to original equipment manufacturers (OEM) components as necessary. Aftermarket performance products affect the correct operation of the regeneration process which may affect engine oil level.

Due to the size of the engine oil system, it is critical when checking the engine oil level, to make sure the vehicle is parked on a level surface and the engine has been turned off for at least 10 minutes to, make sure that the engine oil in the upper parts of the engine has returned to the oil pan.

Check for the correct engine oil level using the oil level indicator with the vehicle on level ground.

If the engine oil level on the oil level indicator is overfull, it is possible the engine was incorrectly repaired or fuel or coolant is diluting the engine oil and filling the crankcase. Recheck the engine oil level. Remove and clean the oil level indicator. Reinsert the oil level indicator into the oil level indicator tube until only the oil level indicator handle touches the top of the oil level indicator tube.

Oil Level Indicator Offset:

If directed to this test from a pinpoint test and the engine oil level is correct, return to the pinpoint test.

If not directed to this test from a pinpoint test and the engine oil level is correct, continue to Step 3 Sufficient Clean Fuel Test, to continue diagnosis.

If the engine oil level is overfull, check the CAC for contamination. If the CAC has engine oil, coolant, fuel or metal contamination, a thorough cleaning of the CAC system is necessary. Refer to the Fuel Delivery and Air Induction for correct cleaning procedures. Clean and mark the oil level indicator.

Engine Oil Level Indication:

Check for recent fuel system repairs which may have caused fuel leaks into the engine crankcase. If a fuel system repair was made and the engine oil was not changed, change the engine oil, mark the oil level indicator and carry out the Fuel System Leak Test to continue diagnosis. 26. Fuel System Leak Test

Check the maintenance records for engine idle time, mileage and vehicle usage since the last engine oil change. Oil that has had extended drain intervals has increased viscosity (becomes thicker) and makes engine cranking more difficult and starting less reliable at temperatures below freezing. Refer to the lube oil chart in the diagnostic/repair information or Owner's Literature for the correct engine oil selection for temperature conditions. If records indicate insufficient engine oil changes, change the engine oil, mark the oil level indicator and carry out the Fuel System Leak Test to continue diagnosis. 26. Fuel System Leak Test

Check for biodiesel fuel of greater than 5% or high sulphur diesel fuel. Biodiesel fuel concentration of greater than 5% or use of high sulphur content fuel can cause increased fuel dilution.

If the engine oil level is overfull, GO to Pinpoint Test AB to continue diagnosis. Test AB: Engine Oil Level Overfull

Possible Causes:
- Engine oil level low - engine oil leak, engine oil consumption, incorrect repair
- Engine oil level high - incorrect repair, fuel dilution
- Engine oil contamination with coolant - engine oil cooler, front cover porosity, head gasket, porosity
- Engine oil contamination with diesel fuel - fuel injector leak, high pressure fuel injection pump leak

Tools Required:
None