New Audi owner here.

I got a checkup of my '98 A4 a couple of weeks ago and the garage recommended that I get an engine decarb for $300.

My mates reckon they saw me coming and that I would be better using 44k and Seafoam.

I haven't taken the car back to the garage yet. I was wondering whether anyone has any instructions for decarbonising using these products, or whether I should be using other products instead. Or even if I should cough up and pay the $300.

you can use almost any thing, SeaFoam, BG44, Berryman's Chemtool, and yes even water.<ul><li><a href="http://www.audiworld.com/tech/eng89.shtml">sea foam decarb</a></li></ul>