If you are going to go with extended oil changes 10-20k miles you must use a high quality filter and if not a Group 3 Polyalphaolefin (PAO) oil, an actual full synthetic oil would be best. Mobil 1 and Castrol Syntec are not true synthetic they are (PAO) Group 3. Red-Line, Amsoil, and Royal Purple are the common true synthetics. If you paid less than $15-$20 a quart for oil it's not a true synthetic.
Your filter has to be high quality. Even then I would advise you change the filter and top off your oil at 8k-10k miles.
Oil filters that are able to go for extended runs are Wix, Napa Gold, and Bosch. Those are the 3 brands I trust for long term use. My truck with over 170k miles drives like it did over 13 years ago when I got it new.
Bosch oil filters. I used them to desludge 2 engines, and it CONSTANTLY keeps pulling more and more out. Only problem, they are black, so leak detection can be difficult if its in a tight spot.
I use Full Synth Royal Purple and a Bosch filter. I drive a 2002 S2K and the RP oil keeps the TCT noise in check.
royal purple, amsoil, k&N, mobil 1 extended, bosch long disance are good for more like 25k or 35k miles
5w50 castrol syntec and bosch filters what ever's on sale.
Bosch 72174 = BIG
I have used both of these with great results.
I just use Bosch
I used the bosch filter anway because I had already purchased it. It has a release valve, Fram doesn't. Anyway the Bosch o-ring was thicker and softer than the Fram's. Hmm, I bet that's why it was leaking.
One lesson I learned when buying oil filters for the VR6 is to NOT buy a Bosch filter. Why? They are about $10 more, and when you pull it out of that pretty little Bosch box and look at the filter, it's a Hengst.
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