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I bought my truck little ovr a month ago, its a 01 2500 HD with the 6.0, i noticed the "slap" within the first week, it has 50k on it, no problems, i switched to mobile one full synthetic 5w-30, ive noticed it doesnt make the annoying slap as bad as it use to, I also run 89 octane in it...
2001 Chevrolet Silverado 2500HD regular cab, longbed, 6.0 vortec, 4L80e, 2wd.
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