I started using Pennzoil in 1966 for my car because my dad, an auto mechanic, used it. I am now 71 years old and have always used Pennzoil in all my vehicles, including lawn mowers, snow blowers, chain saws, etc. I have never had a failure because of oil, and usually get at least 150,000 miles or more out of cars. When people ask why I use Pennzoil, I tell them, for example, that I have always used it in my 15 year old lawn mower, it starts on the first pull and does not "burn" oil. I hope to get 15 more out of it!