So it's been about 200 miles since I drained out the PUP 5w-20 and
replaced it with Red Line 5w-30. I also replaced the RP 20-820 filter
with a Purolator Boss PBL24651 filter.
My Hemi isn't making any noise, no tick/slap, it was just at 4000 mi
since last OCI and I wanted to get a UOA, and I wanted to get the Red
Line in the engine while it was still hot outside.
I have noticed one thing, and I can't say whether this is the new oil
or the new filter (or both?) As long as I have had it my engine oil
pressure has been around 33 psi - 35 psi at hot idle, and would rise
to as much as 66 psi when hot and the engine rpm hit around 4000.
Today I noticed my hot idle held around 44 psi and only once dropped
as low as 39 psi, and no lower.
This was at the factory 500 rpm, coolant temp was 201F, engine oil temp
was 212F. I also noticed that the oil pressure would not go above 60 psi
even when holding at 4000 rpm.
So the oil pressure is noticeably higher at all engine speeds except
very high rpm. Since most of my driving involves running errands
and seeing engine speeds around 1500 - 2000 rpm I'm happy to see
the bump in pressure. I think. I'm no engineer, but I suspect an
increase in oil pressure beats a noticeable decrease.
I'll keep watching to see if anything changes, but I doubt anything will.
My Hemi has been rather consistent about these things.
Just noticed this today and thought I would post it. I'm trying to do
2 things at once right now so I hope any of this makes sense.