David S. Wallens
David S. Wallens Editorial Director
7/9/19 11:42 a.m.

Illustrations by Sarah Young

Three topics that always prove to be controversial: religion, politics and motor oil.

We can’t help with the first two, but we do know about oil–or, more accurately, we know people who know about motor oil. So we queried their scientific brains on the subject, peppering them with common questions. And the answers flowed.



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