Personally I only use Pentosin brand CHF11S.
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Germany
As for gear oil I usually use Redline. For brake fluid I just use Ate SL4 Brake Fluid. PS steering fluid you can use regular ATF fluid or Pentosin CHF 11S Synthetic Hydraulic Fluid.
pentosin/pentosynth 5W40 here, changed it 1K miles ago (second run on this oil), great stuff ecstuning.com sell it for ~28 bucks for 5 liter. I like it much, much more over the castrol from dealership (used that too and after 2K miles changed back to pentsynth). I'm very happy with it.
Regarding genuine VW antifreeze and generic...from what I understand, anitfreeze like Prestone is phosphate free but the real VW antifreeze (Pentosin) also has protectants for the plastic parts of the system, etc. The genuine stuff really isn't that expensive from the dealer.
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