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I used to use and sell Amsoil synthetic - but now in my beater I just use whatever the quick oil change joint puts in - 5w30 or 10w30 whatever - Pennzoil, Citgo, I'm not fussy. If I have to add between changes I buy the same stuff they used, I still don't like mixing brands in the same crankcase load. If I had a new car, I would definitely use Amsoil or some other quality synthetic.
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