Before multi-grade oils, like 0W-20 and 5W-30, we'd have to use different weight oils for various climates. If you lived in the middle of the United States, you would often use a different weight ...

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 ...