ramffml
Senior Member
- Joined
- Jul 12, 2019
- Posts
- 3,113
- Reaction score
- 6,099
- Location
- ramforum
- Ram Year
- 2019
- Engine
- hemi 5.7
Glad to know that I haven't lost it all yet!
I agree with you on the 0W-40 oils; my UOA on the SS 0w-40 certainly confirmed my suspicions. This oil is not even stable in a short OCI; can you imagine how much this oil would probably shear if I had used it for Amsoil's claims of 15,000 miles with severe duty use? While I have it in the engine now, I don't plan on exceeding 2-2,500 miles with it. By then I need to have a replacement oil in my inventory.
With the cost difference for me between the RL and HPL, plus not really knowing how the "new and improved" RL 0W-30 will fare in a Hemi, one of the HPL oils is sounding better and better for my needs, at least through the coming winter.
What is "severe duty use" for you? Guys on BITOG seem to recommend the 0w-40 SuperCar from HPL if that's the brand you want to go with.
They also claim it won't shear down, none of their oils do.
There is a thread where Wayne ran CK-4 5w-20 in a Pentastar for 33k miles with just filter changes every 5k. Not advisable in a hemi, but I'd be very surprised if anybody reports shearing with HPL as they use extremely high quality polymers, this is stuff you don't find in walmart oil.
The UOA's I've seen, including my own of their cheapest PCMO, the viscosity doesn't change or if it does it gets slightly thicker than v|rgin oil due to oxidative thickening.
So a few data points, PCMO 5w-20, the data sheet says it should be at 8.8 cSt@100C and my UOA showed 9.1 after ~6200 miles.
Second data point, P+ 0w-30, data sheet says 10 cST and my UOA showed 10.21 after ~8200 miles.
If you want I can PM you the email of one of the reps at HPL and just talk to him, tell him where you live, what your needs are, and he'll recommend an oil; and you may be pleasantly surprised because they don't just recommend the most expensive stuff either unless there is a case for it.