I like the cleaning suggestions, since I think there could be something wrong with the rings. Guessing: Previous owner drove it hard, oxidized some oil, it got stuck in the ring grooves, and the rings are grinding every stroke in a cylinder or two.
Originally Posted By: 901Memphis
Where did you get that Pennzoil Platinum? The zinc and phosphorus look too low.
Not much lower. According to PQIA, Pennz Plat should have 651ppm phosphorous AW, and this has 619ppm.
Originally Posted By: Doog
You might get some MMO and Supertech 5w30 and do 2 500-1000 mile oil changes to rule out deposits. Then try some Redline 5w30 Group V
If you use MMO, definitely use a 5w-40 or 0w-40 because MMO will thin the sump a bit.
I like the Redline suggestion, but Pennz Ultra 0w-40 is excellent too.
Originally Posted By: 440Magnum
Originally Posted By: AndrewPro
I have the god of all oils going in it next, 0w40 Penzs Ultra.
Not impressed with VOA/UOAs I've seen that oil (Pennz Ultra 0w40), certainly not to the point of calling it the 'god' (or even minor deity) of anything. Its possible its got great anti-wear in an additive pack that doesn't show up on simple analyses, but my guess is that its really just a 40-weight version of their 20- and 30-weight A1/B1 oils.
Pennzoil Ultra 0w-40 has a lot of moly (275 ppm), possibly even the trimer moly from Infineum, in a large enough amount it starts to have AW benefits on top of the usual FM benefits. (Chrysler engineers were touting extra moly in it for their SRT engines a while back.) Also, Pennz has an ad campaign with it being used in racing BMW's. http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3922550/Re:_BMW_Motorsports_uses_0w-40
Therefore, use it! That oil is no slouch.