I was getting my oil changed today (yea, I know. do it yourself), and the mechanic guy took my intake off and was checking the TB and IM. he showed my this black soot/oil that was on his fingers after feeling around in the IM, and suggested that they do a fuel flush clean thing.
Do these conditions sound firmiliar? I’ve used and injector cleaner 10,000km ago. The black stuff didn’t seen to come from the TB, so I’m not sure if TB cleaner would do anything.
Suggestions?