Originally Posted By: jongies3
Originally Posted By: fdcg27
It's not an extended drain oil?
There are a number of UOAs posted here that would refute that assertion.
PP=M1 and PU=M1 EP, although SOPUS's screwed up marketing would never bring this to the attention of any casual buyer.
The Pennzoil syns are really good oils that have had their light hidden under a bushel.
I've run both and have had both in service for decent intervals.
Here is a good looking 7K PP UOA from a '99 Accord we'd bought new:
https://bobistheoilguy.com/forums/ubbthreads.php/ubb/showflat/Number/2984600/Searchpage/6/Main/195802/Words/fdcg27/Search/true/PP_5w30,_'99_Accord_7K_oil,_1#Post2984600
SOPUS should advertise the longer OCI potential of their syn oils, just as XOM and BP do.
Pennzoil doesn't advertise them as an extended drain oil like say M1 EP. Pennzoil says to follow your manufacturer's interval and that oil companies do not set drain intervals, auto makers do. So they are saying 3k to 5k mile intervals for all their products in other words since that's what most cars manufacturers still recommend.
You probably need to spend more time reading through the various threads in the UOA sections as well as come to an understanding of why manufacturers have the recommended OCIs that they do and incidentally, 3-5K recommended drains intervals would be a rarity in any mainstream car these days.
A manufacturer must set drain intervals that allow for the use of the cheapest and least capable oil that can meet a standard like API SN.
A better oil using superior basestocks and offering a stronger add pack will allow for longer drain intervals.
The idea that vehicle OEMs set drain intervals and that oil quality has nothing to do with those recommendations is silly.