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I never ran a tank in my TDI without Power Service. It increases the cetane and increases the lubricity of the fuel. ULSD is a very "dry" fuel compared to the old diesel #2 I believe it was called.

I never had any issues with fuel gelling in the wintertime - even down to temps of -10*F.

I always kept a bottle of power service, 2 gals of diesel and and a bottle of diesel 911 in my trunk. Some guys even kept a new fuel filter in their trunk as well. Even though the mechanical knowledge doesn't transfer, there's a lot of good info/practices over on tdiclub.

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