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  1. R

    oil recommendation

    Well first time posting/registration. I have lurked on this forum for a long enough. I am in need of some expertise. I currently have a 2010 chevy cobalt SS turbo that is fairly modified. OEM oil is M1 5w30 and stock boost was 16 psi. The car as 45k km on it, and only summer driven. After 5k...
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