I would not recommend mixing different additives from different companies. I have just finished reading an interesting report from Volvo that gave some data from an analyst that was looking at what had caused some of bad sludge cases that had turned up in the dealerships in the last few years and one cause he identified was the use of oil additives with incompatible non synthetic oils. If you mix 3 different chemicals from 3 different companies, then you are conducting an experiment which might produce good UOA results for a while, but in the long run could turn out to be a bad idea.
I would just stick to a good fully approved oil of the recommended viscosity that is high in Zinc, although I would be interested to know what additive VW recommend or require for this type of TD, as it is rare for a manufacturer to insist or even recommend an oil additive, although they do change their minds about the engine oil to be used on odd occasions.
Originally Posted By: scurvy
I would use Schaeffer 9000 or Mobil 1 Turbo Diesel Truck (I would not use 0w40) in it. Get the beefiest HTHS number you can.
My PD TDI has shown excellent results & downward trending wear metals on UOAs since switching to S9k with a little ZDDPlus & Lubro Moly MoS2 added.
