10 MINUTE TECH ENGINE OILS

PART ONE

1 WHAT DOES ENGINE OIL DO?

Although the main task of engine oil is to lubricate things, it also has many more jobs: it cools the engine components; removes deposits and transports them to the oil filter; seals the piston rings; and it protects the metal surfaces from corrosion.

2 WHAT DO THE DIFFERENT GRADES OF OIL MEAN?

There are many different grades, and the most common measure to differentiate them still is the viscosity (e.g. 5W-30). However, this is a little outdated these days. In the past, viscosity was the defining factor to keep different oils apart, but today the world of