Originally Posted by
TTRStud
As far as carbon buildup goes, the S5's v8 is no different than any other direct injected engine from Audi. The car that had notorious carbon issues with its V8 was the RS4.
SPOT on.
Like TT said, the carbon problem is SO overblown in all honesty in the B8 4.2, like REALLY overblown. Maybe its luck of the draw, but i have spoken to a few Audi tech's and they say it is hardly one of the common problems in the B* 4.2 S5 in the years they have worked at the dealer since the S5 has been out. They said the more common problems at 50k+ miles they see is a thermostat which my friend just had replaced in his 2008 S5 at 100k miles. Or sometimes the coolant res tank will get heat stress cracks, again easy fix.
My 2010 at 76k, and my friend's 2008 at a little over 100k neither have been carbon cleaned both always ran on 93+ gas with your Italian tuneups to assure the carbon is moving
. Both cars run great his the same as he has had it since about 30k miles. Sure getting a carbon clean may help, or not. But that is with any performance v8. I actually thought bout getting mine done within the next 15k maybe . Some shops in the US are starting to offer the hydrogen clean method which hooks up through the intake and takes 30 mins. A local German shop charges $150 i think for the service and will help a ton if your case is bad.
Of course you can go the traditional method and pay around $800 to get it fully scraped etc. But $800 every 50k miles is nothing.
TT said it BEST, the B7 RS4 gives the 4.2 a bad wrap. They have to be done every like 10/15/20k miles which is nuts. Gotta pay to play my friends.
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