Quote: It would be interesting to know the API SERVICE classification of the actual oil you tested for each brand, that's pretty important to compare it would seem?
Yes and no. Some brands (like Brad Penn, for example) don't have any API classification on the bottle. Others, like SuperTech and Valvoline, do. We just tried to choose commonly used motor oils and a few specialty oils. Oils that are rated API SN aren't supposed to have more than 800 ppm ZDDP (for environmental reasons and because they can harm catalytic converters), but some of them tested did.
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