Yes, there is no doubt it's about the cam/lifter failing, the million dollar question is what's causing it to fail. I've heard soft cams, defective or sub par lifters, short push rods, bad rockers, and yes the dreded oil. Before we all jump on one thing as being the culprit and rule out everything else we should all do our reading. I've read, read, and read some more on this issue and let me classify this as I am no chemical or mechanical engineer. The promoted standard for oil for the 5.7 hemi is ms 6395, which if you look at the chemical makeup of the oils that are ms6395 approved they are all over the place, especially when it comes to zinc and moly content. Some have low zinc and no moly up to some that have alot of both. From all the reading I've done it appears that the hemi engine needs the higher end of zinc and moly for a happy life. Secondly the 5.7 is spec for 5/20, in the majority of the cam/lifter failures the engines have had a steady diet of 5/20, very few reported that were running 5/30, and I don't want to say none but I will say very very few that had been using 5/30 with the higher zinc and moly. What makes this more complex is that the oil companies are changing their formulas to gen2, sn+, gf6. Just because it's the new standard doesn't mean it's better, maybe better for some but not all. I'm not saying that oil is the total answer, just don't get caught up in the idea that I've always used brand X and it's been fine. Brand X of yesterday, last week, last year, will probably not be the brand X of tomorrow.
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