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Message: [QUOTE="windrunner408, post: 428697, member: 1868"] Well I can tell you that I have owned my truck since it had 4 miles on it and I have ran 15w-40 Amsoil in it from my VERY first oil change at 5k miles until about 85k miles. At the 85k mile mark, I switched to 5w-40 Amsoil and I noticed that the engine ran quieter at idle when it was cold outside. About 2k miles later, I added Rev-X and the engine ran even quieter. When I changed the oil at 90k, I did the AR9100 with the Amsoil 5w-40 and the engine ran just as good as the rev-X did. I don't think adding either rev-X or AR9100 is because one is using a lower quality oil. I saw an improvement with my engine and I plan to continue using it even with my Amsoil. JMO and hope it helps. [/QUOTE]

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