Focus Fanatics - View Single Post - anyone using premium gas ?
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Old 05-21-2012, 04:33 PM   #109
Kabigon
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Join Date: Jul 2011
Fan#: 88299
Location: Torrance, CA
What I Drive: 2012 sterling gray Titanium

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Quote:
Originally Posted by gtp2focus View Post
It'll still do good at keeping carbon deposits away from your valves. I'm not preaching, just saying.
Can you post some links to support your claim?

Here is one that refutes it:

http://www.autoobserver.com/2011/06/...-adopters.html

“DI engines are prone to forming oily deposits on the intake valves, unlike in port fuel-injected engines, where a constant spray of fuel into the port allows any deposits to wash away. With DI engines, the fuel gets injected directly into the combustion chamber, so there isn't a chance for the deposits to wash away. Typically, deposits form when soot – which is an end-product of combustion – adheres to the valve stem.”
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