Quote:
Originally Posted by 335dFan
I expect that somehow we need to provide a solid link between the failure of a warrantied part and the carbon build up, or it will just be judged normal wear and tear. Some direct evidence of cause and effect more than just anecdotal.
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the problem with that is that the build up is caused by parts working properly, not broken. This is why carbon buildup alone is not warrantied. All of the manufacturers are taking this position because carbon buildup, for now, is a fact of life with the majority of direct injected engines out there. If they warranty carbon buildup they will be doing $1000 warranty work on every engine under warranty and thats not sustainable.
The only possible failure or malfunction I can think of would be that the PCV (CCV) is passing excessive oil through the system leading to the buildup