Hi all,
Some of you may remember my high FE HEMI Mobil 1 0w40 thread.... The issue ended up being the hardening layer of the cam wore off, everything else looked fairly good.
The engine got a comp 224/234 cam (over .600 lift) as well as a complete timing and head job with a hellcat oil pump. It makes 429hp to the wheels on a dyno, which is pretty much the most you'll ever get or can ask for out of a N/A 5.7 with stock pistons. I've been using M1 0w40 , M1 15w50 and a current fill of Pennzoil Euro 0w40.
I am hard on this engine, and it does see the drag strip occasionally, so I defiantly look for Zn levels above 1000 ppm. Cats are a non issue. Have a stash of Rotella T5 (and some T4) 15w40 that i'm likely going to pour into this engine. T4 is now a syn blend with no moly and T5 is also a syn blend but also has trimer MoDTC based on the numbers as well as a healthy dose of ZDDP and boron. Given how hard I am on this engine now, plus the added horsepower, I doubt ill ever exceed 3k miles on a OCI, so I'm thinking of just using the Rotella from now on.. It's cheap, seems to work well in most applications, and readily available.
Plus I think the 15w40 will be a bit more shear stable than the 0w40s... Will get a UOA sent out of this Pennzoil 0w40 that's in here now then will do another with Rotella and see how it compares.
Curious to hear thoughts on this