I noticed a huge difference in how clean the oil was midway between changes when I went to a Mann filter from a Purolator filter.
Best is sticking with OE stuff (VW, Mann, or Mahle - Mann filters can be had from many places online.) If I were to shotgun parts at this (read: not bother checking pressure with a gauge, just throw parts at it), I would do a good filter, and an actual VW pressure switch
I run all of my fleet either on OE VAG filters or Mahle and Mann who are the OEMs for VAG. I buy filters in bulk, depending on who has which filter at an attractive price at the moment. Right now I have a Mann HU 719/7x in the Eurovan - according to the maintenance spreadsheet I bought it for $7.72 from autohausaz.
Nothing special about it- it's one of the easiest cars I've changed oil on. As others have said, just stick to a good quality OEM-spec filter and full synth 0w-20 oil. And it does help to replace the drain plug washer every time, or else it has a tendency to have a few small drips on the plastic splash guard by the time you next change the oil.Most modern filters will have the anti- blowback valve that the OEM filters have. I use Bosch premium oil filters and Pennzoil Platinum 0w-20 full synthetic.
Make sure you get ONLY an OEM Mann oil filter or you WILL have oil pressure issues and you WILL shorten the life of your motor, guaranteed.
my 17-yo, 168k Golf 2.0 gets 5/30 full synthetic and either WIX or Bosch filters.
Buy Mann/Mahle or equivalent filters - Amazon/ebay/rockauto. Those are OEM suppliers.
Youll be fine without a subaru filter, if youre using it long enough that it creates the pressure to go into bypass you need to stop being cheap and replace the filter each change and change more often.
I use Bosch Long Life D3300 oil filters and Rotella T6 5w40, gonna see how Motul 8100 5w40 does in comparison.
Avoid 5w30s most of them sheer to a 20 weight by the end of the change interval if you drive your car like its meant to be.
I've never had issues, and I oil test my car a few times a year.
Last tip: if you change your oil yourself make ABSOLUTELY certain you use an OEM Mann filter. DO NOT use whatever Fram, M1, or whatever brand filter they have at your local autoparts store.
I bought a Mann brand filter for less than 3 bucks on sale! In my case though the filter didn't help even though the old one was way dirty.
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