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castrol magnatec or mobil 1. castrol magnatec sticks to the camshafts and that when you turn your engine off, so that u dont get wear in the engine when you turn it on. whereas mobil 1 doesnt so you get more wear, however it is better performance wise....
We've used Silkolene from Opie in our endurance F4R's - when the engines come apart they are still clean, shiny and with a basic refresh ready to go again.