1. Which of the following SAE multigrade oils would likely be recommended by
most highway diesel engine OEMs for year-round use in North America? 5w-30
2. Which of the following API classifications indicates that the oil is formulated for diesel engines meeting 2010 emissions standards?
3. What conditions could result from a high crankcase oil level?
Lube oil aeration, oil pressure gauge fluctuations, and friction bearing damage (all above)
4. When investigating a low oil pressure complaint, which of the following should be performed first?
Check the crankcase oil level.
5. A full flow oil filter has become completely plugged. What is the likely outcome if the engine is running?
A bypass valve diverts the oil around the filter.
11. Engine oil service classifications are standardized by which of the following organizations?
12. Technician A states that the operating temperature of an engine oil should be within 5°F of that of the engine coolant operating temperature. Technician B states that engine oil temperatures are probably a more accurate means of assessing actual engine operating temperature than the coolant temperature reading. Who is correct?
14. Oil that has a milky, clouded appearance is probably contaminated with:
20. A diesel engine dash oil pressure gauge displays low and fluctuating oil pressure values when the vehicle is operated. Technician A states that this could be caused by low engine oil level. Technician B states that this could be caused by high engine oil level. Who is correct?
How often should you change the oil in your truck?
- Driving Habits: If you push your vehicle too hard, drive it on steep inclines frequently, or consistently drive on rough surfaces, your efficiency will drop and your oil will need to be changed more frequently.
- Driving Conditions: Driving through severe heat or severe cold for hundreds of miles impacts your oil. It will loose its thickness in heat, and becomes thicker in cold weather. These both have adverse affects on your engine, and could therefore force an oil change sooner than planned.