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      08-07-2013, 08:50 AM   #23
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Originally Posted by Lute View Post
Of course, it is the future, you can get more power with the same or better gas mileage, the issue is how do you address valve maintanance going forward. Thankfully the s65 is port injected so these are issues I don't have to stress for now
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That and the other car I want, a 997 Turbo. No DI for me yet
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      08-07-2013, 11:55 AM   #24
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Quote:
Originally Posted by Lute View Post
It's really quite simple. Standard engines use port injection which sprays fuel "over" the intake valves where the gasoline additives such will help keep injectors and valves clean.

Direct injection sprays fuel "under" the intake valves directly into the combustion chamber. Fuel additives and cleaners will do nothing to clean valves in this case only the injectors. The only way to clean valves on a direct injection engine is to remove the head and manually clean the valves.

To answer why they use direct injection, main reason is better metering of the fuel air mixture which improves fuel efficiency and MPG.

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      08-07-2013, 12:06 PM   #25
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Quote:
Originally Posted by Lute View Post
Of course, it is the future, you can get more power with the same or better gas mileage, the issue is how do you address valve maintanance going forward. Thankfully the s65 is port injected so these are issues I don't have to stress for now
It is mostly addressed in the new cars now. Toyota, Honda, Nissan, Mazda etc. all are using DI in their engines now. Given their reputation for reliable cars, they have to have figured this out otherwise there would be a ton of complaints given the amount of Hondas and Toyotas that are on the road.
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      08-07-2013, 04:16 PM   #26
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http://www.audizine.com/forum/showth...-up-Megathread

Given the stable of brands under VW AG, I'd be curious to see how DI is treating some of their other cars after a couple years of service.
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      08-07-2013, 06:25 PM   #27
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Although Seafoam is used in fuel, it's also used in the crankcase. I think that might have been what the OP was talking about. I've used it a long time in my cars (mainly older cars with more miles) and it's great stuff. Just my opinion though that I'll stick with the recommended oil, change every other interval myself (let BMW pick up the other), and buy the best fuel I can get locally. I'm going to leave the additives out of mine.
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      08-08-2013, 08:31 AM   #28
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I've used Seafoam in the past. I was happy with it. The OP is on the east coast and probably runs Shell or Sunoco fuel. I don't believe either of these fuels have Techron in their additive packages. Techron would be a good choice as someone else recommended. I alternate between that and Redline Fuel Injector cleaner. I also alternate between Shell and Sunoco to take advantage of their differing detergent formulations.
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