Engine oil Mobil or AMSOIL
0-40W here all year round in Chicago 138k miles and still going strong
I just changed my oil and filter on my 2006 GLI 2.0T. I used Mobil 1 15w-50 and a MANN filter purchased from the VW Dealer. My best friend is an awesome Audi/VW tech and he advised me that was fine combo.
i used their oil before and was very happy.
I use Amsoil full synthetic 15w-40 year round in my 1.6D with over 250k miles.
Amsoil 20w50 in my 8-v 12:1+ 1.8 liter Rabbit Amsoil 5w-40 in my street turbo Jetta and track turbo Golf.
On the 16v I had I also had a cyl head temp gauge and temps dropped from 240F to about 210F when I switched from Mobil 1 to AMS, so did my oil temp drop fromt eh 250 to 215 range.
I switched to amsoil 20w50 and the temps are down to 230ish
With the AMS and a 20 row cooler my temps stick at 190-200 dependant on ambient temps thus far.
i use mobil delvac 1 5w40 synthetic oil in my 2000 beetle tdi.
Stick with the synthetic. The tiny turbos on the TDI's are heavily stressed and mineral oils are just not up to the task of protecting the bearings in the turbo.
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