The French motor oil company Motul may be best known ... if their vehicle goes from under 75,000 miles to over 300,000. Shell's Rotella line of synthetic oils is one of the most popular diesel ...

Let’s explain all of those confusing numbers, letters and terms to help you choose the right oil for your car.

This time, the channel has set up an Olympic pentathlon for diesel oil. Six brands take the start line: Mobil Delvac at $14 per gallon; Shell Rotella ... III semi- or full synthetic; the Hot ...