The 30 is the way to go. It's better in most every way and is not that much more. They use a better filter media and seals for a longer service life.
Mann & Mahle filters aren't all that expensive and since needing them won't be a surprise type event; buying them can be scheduled prior to need.
I typically use Mobil 1, Valvoline, or Pennzoil fully synthetic 5W-30; whatever is on sale. I use a full synthetic and change it every 5000 miles.
Use a good quality oil filter too (not Fram). I typically use Napa Gold, Wix, Mahle, or Mann
I typically use a Volvo/Mann filter, with 4K intervals.
You should stick with the OEM filter, made by Mann or Hengst. You can buy at VW dealer or Amazon.
Mann is OEM to many manufacturers. Since I've been fixing German cars for 35 years, I'm pretty certain I have seen more used oil filters that you ever will. As a diagnostic technician for over 20 years, I bet I cut open more oil/fuel filters too. I have never seen a factory [Mann, Hengst, Mahle] filter not do their job in the time/mileage they are suppose to do it. I have seen them fail after 40k miles, but that is not what they are designed to last.
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.
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.
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