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Old 08-22-2010, 10:07 AM
645/333's Avatar
645/333 645/333 is offline
Location: uk
Join Date: Jun 2010
Posts: 1,623
Mein Auto: BMW 640i SE Convertible

Most of the additives are rubbish, but there is one which is used by some major prestige cars on their service and it is GK44 which is readily available in the US. I have used this in my car and is brilliant, not cheap to buy but worth it every 15-20K miles to keep the fuel system clean
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