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I have a 2003 GMC Sierra 2500HD and a 1999 GMC Sonoma, both of which have the GM dex-cool. Neither of them have any apparant sludge build-up but I want to replace it with somthing that won't sludge up on me. From what I've read on here, There is either the G-05 or the prestone Dex-cool that...

I am building a 383 SBC to put into a 93 S10 and was wondering what some good break-in oils are? I know I will want to run a dino oil for the first couple changes and I'd assume I'd want somthing with a high moly content. I plan to change the oil 3 times in the first 1000 miles (after the cam...

ok guys help me out, i'm not sure what everything means as this is my first UOA. 2003 GMC Sierra 2500HD 6.0L V8 Schaeffer Supreme 7000 5W30 Oil was put in at 4,500 miles, taken out at 10,186 Oil has 5,686 miles on it Copper - 175 - Think this is due to break in? Iron - 73 Chromium - 2 Aluminum...

I've read on here that some companies (Honda, ect) use a special break-in oil (high content of moly) and that you shouldn't change it for a while. I just bought a new GMC Sierra 2500HD with the 6.0L and was wondering if GM uses a break-in oil? Also was planning on running Schaeffer 5W-30 with a...