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what are most gt/cs owners running for oil in there cars? i talked to a old mechanic and recommended running 20/50 with a quart of rislone additive to thin out the oil? would this br wise? this is for a 302.
I use Castrol GTX 10/30 in my J code. No problems noted. In fact, I've used the same oil in all my cars over the past several years. I change it every 3,000 miles without fail.
Depending on the age of the engine> most diesel oil will work much better on owner engines, so I have heard. Pep Boys just check the API rating in your owners manual . Most of the newer oils have alot of crap that these older engines do not need.