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Duke, thanks for the detailed response. The slight risk of ruining a cat from running 15-40 oil does not bother me in the least. From what I have found, the impact is minimal. My car does not use any oil between changes, so I doubt the cat will be affected in any way. It has passed emissions testing with no problem. It would be nice to find someone that has used this oil in their engine, and would give thumbs up or down. I may have to be my own "guinea pig" for this one.......Rich
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