Quote:
Originally Posted by M5theonlyone
How often do you add it, every other fill up?
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I have not used it on the M5 as its only done 16,000 miles but use it in the Wifes Golf GTi and it feels smoother. The first use seemed to make the biggest difference.
I am going to add to the M5 though as it wont harm and the injectors may benefit from a clean.
Probably add it every few months