Best oil to run.
I recently swapped from Castrol 10w40 to Royal Purple 10w40 HPE. After about 1100 miles it looks dark and broke down. I see on the LS sight allot of the guys are running the Shell Rotello 5w50 with good results. What do you guys think about running this oil in a LS? I know it has more Zinc than most oils but what about the weight?
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