faqs: automotive oils and lubricants

Questions

1. What is the standard system for classifying viscosity of Engine Oils known as?
2. What benefits do multigrades have over single grades?
3. Who are the Industry bodies responsible for Engine Oil Quality?
4. What is the latest Quality Level set by API for Gasoline Engines?...
5. ..for Heavy Duty Diesel Engines?
6. Can you use an API SL quality oil where the manufacturer’s handbook specifies SG or SH?
7. Can you use an OILS AND LUBRICANTS Car Motor Oil in a diesel car, van or light truck?
8. ..In a vehicle fuelled by Natural Gas?
9. In what way is oil lubrication provided in two-stroke engines?

Answers

1. SAE J300 standard
2. Maintain their viscosity better over a wide temperature range.
   Can be used as year-round lubricants.
3. Mercedes-Benz, Volvo, VW, Nissan, Ford, GM, Toyota, Renault
4. "SM"
5. "CI-4+"
6. Yes
7. Usually, yes, provided unusual diesel requirements are not specified. However, this situation is changing.
8. Yes
9. Pre-mixed with the fuel
   By direct injection to the combustion chamber.