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Originally Posted by Matthew amsoil has a cleaner that they suggest using before using their oil. i was thinking about doing that just to make sure, but im alittle leary that it may cause problems. its supposed to loosen up the crud. |
Sometimes the crud is all that's keeping the syn. oil from leaking through high mileage valve covers. I had leakage with my 1980 Pontiac and Mobil so I use dino oil in it now.