Originally Posted By: Garak
Originally Posted By: RGR
And when you can have a 5% Noack with a 5w-30, why would I want to use something heavier? At least while the car is in warranty?
It is always a balancing act, though. I don't know how cost effective the previous PU was, but obviously, it was a bit of a sales nightmare. Low Noack is fine, if you can find the oil in the first place. One can have low Noack at a very low cost, which is why I indicated the bizarre grades.
I have been scouring the Denver area for PU, visited 3 new stores last night, collected 2 jugs of PU 5w-30 with the right bottling dates to have the fuel rewards codes under the cap. Collected some PPPP 5w-30 as well, it having a Noack of 10%…which while not as good as the 5% of PU, will just have to do.
The wife is starting to sound the alarm over the stash however, so I will soon be forced to scale back my quest for a massive low Noack stash in the proper weights.
I might also mention that even some 10w-30's appear to have a low Noack, such as PUP and PPPP. Only one machine I can conceivably use that on in the next couple years however, so I don't plan on stocking up on it.
Originally Posted By: Garak
Nonetheless, quality base stocks and low Noack aren't everything. That's part of the package. Look at the local Co-op's 0w-40 HDEO. It is primarily PAO (they really push that), yet has dated diesel specifications and some pretty unimpressive numbers (aside from the PAO specific numbers). No one can deny it's got a fantastic base stock, though. Yet, any off the shelf conventional 15w-40 meets more specifications and has more builder approvals. Go figure.
I try and stick close to builder requirements during warranty. Afterwards however, I just don't have enough temperature difference to worry about for the garaged machines. Otherwise I figure thinner isn't bad for short trip and low temp around town type stuff, something heavier for cross country trips, and just make sure it gets changed at reasonable intervals. Has worked okay for the last million miles of driving history, hopefully the track record will continue.