Originally Posted By: Mark72
I don't think that many of us use PYB as they claim. You very rarely hear it spoken of... I think there has only been 1 single UOA on the "next generation PYB", and all I see for the most part are boring synthetic UOA's. Most of us realize how synthetic performs. To me it's the conventional oil UOA's that are more exciting. The thrill of spending less and getting that same or greater protectin than many of the synthetic users out there get. I would post my PYB UOA's howerver, I have none, my drain intervals are rather short.
Before my comments get misconstrued, remember that I do use synthetic about half the time. I would suggest that those people who use PYB (or any other high quality conventional) are looking at the best bang for their buck, and not much else. They're not trying, necessarily, to squeeze every last mile out of the oil. They set what they think is a reasonable OCI and follow it. At least some synthetic users are likely trying to justify to themselves and others the premium price they pay, or, alternatively, to extend their OCI as long as is possible and use a UOA to that end.
My dad used to run fairly long OCIs with conventionals in taxi service. If I would have suggested a UOA to him, he would have laughed me out of the garage, just like he did when I suggested synthetic. The engines lasted hundreds of thousands of miles on conventional with 6,000 mile OCIs, and that was the early 1980s. No lube related failures, no sludging, no synthetic, and no UOAs - just conventional QS in 10w-30 year round.
