Over the past 40-plus years, I have changed the oil in more engines than I can begin to count. If you're about to change the oil in your car yourself, consult the owner's manual that came with ...

The main keys are weight and formulation. Weight is the number you'll find in the car's manual and on bottles of engine oil.

Deere, Cummins and other engine builders now recommend a break-in period of up to 500 hours before switching from break-in oil to standard multi-grade engine oil. Engines WILL burn oil during ...