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Those RS4, S4, S5, 335i, M3 and Cymans will not be a problem for you in a year or two. Do a research on Audi, BMW and Porsche direct injection carbon deposit problem and you'll know why. They have a major design flaw in their direct injected engines on these cars. From about 5,000 miles and on, excess carbon deposit builds on the intake valves. Over time, this causes slow start, rough idle, power loss until at about 50K miles, the engine will die because it choked itself. I seen and S4 FSI cylinder head that literally had all the intake parts locked up because it was filled with rock solid carbon deposits. So these cars will self-destruct. The only other way to prevent this is do tear out the cylinder head and clean everything by hand every 5K miles. Sad part is that Audi and BMW knows about this, have refused to do anything about it and keeps on selling these cars knowing the engine will die ... after the warranty expires.

This is widely talked about in other forums where owners are envious of Lexus' foresight of having dual port and direct injectors which cleans out the valves and solves this problem! So you see... he who laughes last laughes the longest:D

http://forums.anandtech.com/showthread.php?t=2070545
Ted, thanks for the link, this is great insight into why Lexus does things the way they do. Long term testing, etc. Great information!
 
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