mobil 1 ow-40 is what i use. YIPPEEE

 

I have been running Mobile 1 0w40 (aka - european blend) with the Mobile 1 extended filterfor the past year and have no complaints. This next oil change i bought Royal Purple 5w30 to see how that stuff is. But it wont be an accurate test since ill also be Sea-foaming the car.

 

I would say because 5W30 doesn't meet either spec: ACEA A3 or VW 502/505. However,bothMobil 1 0W40 and Castrol Syntec 0W30 <made in Germany>and 5W40 do for sure.

 

0w40 is pretty thin while cold, yet stays thicker under high temps, giving better protection.

Here's an excerpt about vicosity.

For a turbo, which gets very hot, 0w40 is pretty good.

In 5W-30 oil, for example, the two numbers mean it is a "multiviscosity" or "multigrade" oil that is effective over a range of temperatures. The first number, 5, is an index that refers to how the oil flows at low temperatures. The second number, 30, refers to how the oil flows at high temperatures. The W designation means the oil can be used in winter.

A popular belief is that 5W-30 oils, despite their designation, are too thin to protect vital engine parts when they get hot. However, laboratory tests measured the viscosity of oils under high-temperature, high-stress conditions and found essentially no difference between 5W-30 oils and their 10W-30 brand mates. But at low temperatures, the 5W-30 oil flowed more easily.

 

Christ, 5w30 isn't going to hurt anything..... Use whatever you feel listed here. I honestly think you can run whatever synthetic you want in your 1.8t - so long as your change interval is reasonable and you're using a good filter (ie: NOT FRAM)

 

0w40 is factory-fill stuff. That's what I use in my car (Mobil 1 0w40) with OEM filter. I think factory fill is Castrol, though.

 

https://www.audiforums.com/m_16044/tm.htm

 

for a 98 2.8 w/ 95k is 10w30 synthetic good? no turbo.....

 

I use 10w30 synth - no pbolems

 

i have to use a 30w-50 royal purple or another synthtic... beause my my turbo wears down oil way to fast...