I've used AMSOIL since 1977....in everything from to name a few, my 83 GTi, 88 Scirocco, 04 R32 and now the wife's 06 Passat 3.6L as well as my 04 Volvo S60R and have never had an issue. I use the 5w40 in the Passat and 0w30 in my Volvo.
I've kept using GTX in my Passat and just recently had warranty work done (cam adjusters, valve cover gaskets etc.)...dealer honored the warranty and I got no feedback that my engine was "sludged up due to non syn oil"..so I'm stick with it!
ok i just did an oil change today. i put in Elf Excellium 10W50 Full Synthetic. anyways, the difference is awesome. much more free reving and "wanting to go faster" feeling. before oil change it felt tired and revs were lazy and engine had a 'fuzzy' sound when accelerating. anyways, all is good now
Cost...$9 for filter online, $1/QT for Castrol GTX with rebate...so $15 or so...knowing that everythings done right..priceless!
castrol 5w40 is what vw puts in the new passat. just did my 5k oil change the other day. i used a original vw oil filter also.
In the early years only VW dealers carry Castrol Syntec 5w-40 oil which is where I am always getting from.
Valvoline Synpower 5W-40 also meets Volkswagen specifications.
Put in 4.0 US Qts. of 0W-40 Mobil 1 (extra due to larger filter). Started the car briefly to check for leaks. Based on my measurement, with the new larger filter, 4.0 quarts will bring you to about 60% up the crosshatching on the dipstick. So, I added another 1/4 quart (8 oz) and that seemed to bring it right to the top. So, 4.25 quarts is what I will be going with in the future.
castrol 5-50 synthetic in my vr6 passat , 5-40 mobil-1 delvac in my TDI passat.
I refill about 1/2 qt of oil every 2500 miles.
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