This is what they use at the dealer. They pull the fuel pump fuse, hook this up to the fuel rail, put in a bottle of the same Techron or whatever brand fuel injector cleaner that they sell to put in your gas tank, and then hook the bottle up to compressed air and let the car run until it is empty. Bam - $150 fuel cleaning service (or $250 if german car)


Whether it works or not I am not convinced.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau