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I have a supercharged ecotec with 90k that is currently filled with GC, however I work for a competing parts chain and was able to get M1 (5qt and filter sale, plus 2 discounted) at nearly half the cost of my last GC fill. This engine is one of those Mobil 1 "factory fill" cars, so I folded...

This car sees some abuse, is rather high mileage for its age (nearing 60k), and the engine sees a ton of heat. I'm currently doing GC @ the OCI determined by the car's built in algorithm. Does GC have good cleaning properties? How would M1 0w-30 compare? The car calls for M1 5w-30 btw

Hey, I'm kinda new to the game here. I'm from the school of thought that "as long as its synthetic, its fine" and recently started researching different oils. I just wanted to know if anyone could offer some advice on GC. I run it in a 2006 Cobalt with the LSJ engine. It is a high heat...