Posted by Steve@Advance on August 01, 2018 at 15:38:41 from (24.182.105.179):
In Reply to: Re: top tier gasoline posted by Geo-TH,In on August 01, 2018 at 12:02:05:
Reading the article, the main concern is intake valve deposits.
Just about all the car and light truck engines are now GDI (gas direct injection). It's an improvement, gives the ability to run higher compression without detonation because the gas isn't in the cylinder until time to fire. Higher compression gives more power and better mileage.
But, there is a problem. The fuel goes directly into the cylinder, not in the intake, so the back side of the intake valve tends to build carbon deposits. The traditional fuel systems kept the back of the valve somewhat clean by the fuel constantly bathing the back of the valve, but even then when the guides and seals get sloppy, or the vehicle sees short trips and city driving, they will carbon up.
The deposits come from burning oil that comes down the guide. The mfg's require only approved oil, and a strict oil change policy. The problem can be far more serious than just lagging performance. If enough carbon builds, it can break off, hold a valve open, or get on top of a piston. Not good!
The requirement of high detergent gas can help keep deposits out of the combustion chamber, and keep the injectors clean, and may have something to do with the elimination of a serviceable fuel filter.
But, it still doesn't address the valve deposits, because gas never goes there! I don't know what they are doing to remedy the problem, possibly some are injecting "some" fuel in the intake. In that case the high detergent fuel would be essential.
The list of suppliers looks to about cover all that I can think of. One missing though, Murphy, is Walmart gas!
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