Yes, that has happened before. The problem is, that most folks think that they can just substitute Amsoil for any other Brand and go from there. You can't! Amsoil is of a completely different chemical make up, and thoroughly cleans the engine. If first they don't "flush" the engine of all contaminants, the Amsoil will "clean the engine" and the contaminants will continue to circulate throughout and quite possibly do even more damage, especially if an Amsoil filter is not used. I know truckers that have over 150 K on a single oil change, and one in particular that not long ago had his engine torn down at 409K, by Cummins. After inspecting the parts, they put the engine back together without replacing anything except seals and gaskets. Everything was within "new" specs. This particular engine had had only one change in 409K. I believe the filters were replaced every 10K. Theres a right and wrong way to do everything, and with Amsoil, you MUST flush the engine prior to installation of the oil, and make sure the "air" is clean. I've had tremendous results with Amsoil, ( and I was the ultimate skeptic) as have countless thousands of others. But we've followed the proper procedures.. Fly happy!! Doug
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