2006 Jetta TDI w/Koni FSD, Shine springs, EBC rotors/pads, Kenwood radio/GPS, updated VW shark-fin.
I've been using semi-synthetic 505.01 5w40 in my 2006 Jetta TDI BRM for 14 years. I am now finding that I cannot find Motul specific 505.01 that I've been using. They now have 8100 fully synthetic and I see a similar Liqui-moly semi-synthetic 505.01. I prefer 5w40 for its additional protection even though mileage not quite as good as with 5w30. Any thoughts on what I should use going forward? Would fully synthetic be better or worse for the car at this stage? Or should I stay with a similar semi-synthetic type like I've been using over the years. Car has run superbly since new and so far no camshaft issues so I want to keep it running great. Thanks for any advice.