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[califguy33]

Mobil 1 has a drain interval, read the bottle, and they have extended drain oil. I agree you cant trust a report from amsoil saying there oil is the best. I heard somwhere that castol synthetic is one of the worse. You need studies from test companies who dont make oil. I think most synthetics are probally pretty close to doing the samething, give or take a small amount.

mike