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Castrol is the only one that make 10w60? Is it even a class iv synthetic oil? I dunno how familiar you guys are with synthetic oils, but I'm sure there's gotta be better stuff out there. All my cars have run noticeably better on Amsoil synthetic compared to say, Mobil 1 synthetic.
When I say alternative, I mean alternative brand, no more than that. Still want to run a fully synthetic 10w60.
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