Originally Posted by burla
FCA values detergency, clean oil, and super high moly for the hemi, stay in grade not so much. I'm sure you could make an argument that maybe they should have added stay in grade specs as part of their lubrication strategy, but the 0w40 srt PUP oils tend to have a cSt a little higher then oils like m1 even esp or fs. So yeah maybe they could have made the srt oil better if they would have considered stay in grade more, but those stay in grade oils with their fancy specs also could be better as far as detergency and moly levels as well. I haven't really looked at a list that has includes all considerations, I know the boutiques tend to have the entire enchilida as in all 4 catagories covered, but maybe there are some otc oils that meet everything? Moly level is clearly key with the lifter issues, but so is detergency keeping those roller bearings clean. When you consider what plagues the hemi, you need to consider the entire package imo.
Food for thought, but if Moly levels were key to keeping the lifter issue at bay, those using the SRT lube wouldn't be having lifter issues
Given that the Euro specs also include requirements for cleanliness over extended drains, I don't think that's a concern. M1 0w-40 is actually one of the very few lubes that has been advertised as cleaning, rather than just keeping things clean, FWIW.
Further to the thing about moly levels, I firmly believe this isn't the magic panacea that it is made out to be. I'm running a lube with no moly in it in my 6.4L and it has the Chrysler approval. There are a ton of oils on the market that are approved by Chrysler that have much lower levels of moly, which, if it was indeed such a critical component, would be included as part of the spec. Furthermore, those using oils with little or no moly (like myself) should be experiencing lifter issues. I'm not, my 6.4L is as quiet as a HEMI can be, with zero tick, on this lubricant.
I'd put keeping the needle bearings clean far, FAR above moly in terms of importance, as there are other additives that can be as effective, or moreso, than moly, but there's no substitute for cleanliness.