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On my TDI Golf, there is a bit of a wait for the glow plug indicator to turn off on start, notably longer for being cold but not longer than 20 seconds. I do not know if they stay on for a while afterward like in the F250. Below 20f, the 250 gets two heats before cranking. The golf is garaged, the 250 outside.
If it isn't throwing codes or warnings something else is odd, but if you blink funny on mine you get a warning light that requires a VAG or Torque scan.
I also use a fuel modifier on both
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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