Originally Posted By: mechanicx
You have seen that filter efficiency matters and probably the center core type you just don't want to accept it. There are studies that show the higher the efficiency in the 2-20 micron range the less engine wear and the longer the oil life. this is one reason there are high efficiency filters and bypass filters. How much difference would the P1's higher efficiency over a ST or Fram extra guard matter in reality is probably debatable. But a couple dollars per OCI seems worth it.
Millions and millions of engines going the distance and they are not doing the "extra couple of $$ per OCI".
I've never done it. And taken plenty of engines well past 200k between myself, family and friends/co-workers who have bought my used vehicles.
They all have run fine, pass smog and have no issues. I don't know but most of those miles have been with Fram filters (I'd say our 394,000 mile Jetta saw Frams 99% of the time).
How much better could the engine have done? It passed dyno'd smog with flying colors, ran perfect, never had a single issue and sadly died with a excellent running engine.
How much better would have it done with a "couple dollars per OCI"?
Take care, bill
PS: And the Jetta is not the only high mileage vehicle I've dealt with. So its not just that VW makes a good motor (cause they did. Same with my Chevy truck, Toyota truck, Sisters Caravan and so on.