Quote:
Originally Posted by Nicul15
was your experience with a BMW?
Why does a turbo make a difference? Can you explain? interesting point.
On a different subject, I have seen plenty of 350s, LS motors, and pontiac engines that have coking after 50,000 miles. Coking is nothing new, what is new, is the extreme coking we have seen from Audi/VW 4cyl and BMW DI engines. Those engines look horrific after 100k. I remember almost 8 years ago the first VW DI 4cyl we tore down and everyone in the shop looked mortified. this was on a K04 Jetta with meth that had a catch-can
the pics of the valves on corvette forum look normal enough to me from a picture.
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VW funny enough. Sounds like you have seen and had the same experience I did. I had a '09 2.0TSI in a Jetta. At 30k miles it had lost a couple of MPG average on each tank and some loss of power. Had them perform the upper intake cleaning while replacing the defective intake manifold. Immediately MPG returned to normal.
Like MikeSS said, turbos force more blow by (likely because of the increased pressures of FI). Someone probably has a better answer as to why.
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