I've been running the GT TDI on Mobil diesel since day one. This afternoon I decided to try Shell diesel and I'm sure I'm not imagining it, the car actually appears to be running a lot smoother and is picking up much quicker than it has been. I just ordered some of that Amsoil Cetane boost to try in the next tankfull of jungle juice as well and I'll come back with the results. 
Russ

Russ
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