I usually run the signature line. However this outback is DI and really loves to dilute fuel. We’re talking 5% + with 2800 miles. That’s why I went with Amsoil OE which is their economy line. Comes out to about $27 a gallon. I did a 4800 mile signature run on this car and it took a beating. It barley held within 0w20 viscosity rating.
Two 3K mile OCIs for 6K miles total on that oil filter is no problem. Don't remove it to drain the oil, just leave it undisturbed.
That Amsoil filter has a bypass rating of 11-17 psi. The Subaru spec is 23 psi. Unless this filter has unusually low restriction, it's going to be bypassing oil quite often on a Subaru, due to the high flow oil pumps used on these cars.
My vote is keep changing the filter everytime. I’d want to get as much of the diluted oil out as possible. I know we aren’t talking about much oil, but keep in mind, we aren’t talking about much money either.
So what's the point of this post? You've already made up your mind.
Except, you drain the filter first before changing the oil.
Unscrew the filter, empty it and screw it back on using the used, possibly flattened, possibly embrittled gasket?
if the gasket brittles after a year, something is very wrong.
Doesn't this industry appear to push boundaries of quality constantly? Granted, an oil filters gasket is likely cheap enough to under the penny pinchers' radar, but batch-to-batch quality undulations seem to appear everywhere.
You've fallen for an old wives tale. Unless the filter has been on there 5 years, breaking the seal and putting it back isn't going to result in a leak.
The oil isn't dirty, it's just diluted.
The PL14615 is rated 99% at 26 micron. The PBL14615 is 99% at 46 micron according to the spec sheets, but the test didn't seem to be based on this particular filter model.
