These are the times when I really miss my Grandpa
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He was a head distributor for Kendall Oil for 30 years and I remember as a kid him always sending samples out to the labs for testing of wear and viscosity break downs. Too bad I was so young then and he died before I would find the need to learn this kind of stuff for my everyday uses. I use Royal Purple in my Dart and Kendall in my street car. I would use the Kendall in my Dart if I could find the racing stuff instead of the plain 10w30/10w40.