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I ran non synth 20w50 gt1 in my sc, but got coking in 930. Now I use M1 15w50 and no issues. It’s cheap at Walmart, $28 for 5 qt. Used to be $21…
Edit: not saying M1 15w50 is right or best or anything, just what I’m happy with. I’d need a reason to switch.
Last edited by zakthor; 01-23-2022 at 05:01 PM..
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