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I think historically the gas additives weren't anything that special and not really needed in the fuel injected engines of years past, at least in areas that had quality gas that included detergents. However the more and more I read about these high pressure Direct Injection setups the more I am seeing actual pictures of enormous carbon build up in places where a normal fuel injected motor wouldn't get near the amount of build up. As more and more efficient DI setups hit the streets and start accumulating miles I am very interested to see how this play out. Furthermore, it would be interesting to know how this larger build up of carbon is potentially reduced due to using fuel additives.
Personally, I may give the wife's X3 a little fuel additive lovins. Snake oil.... maybe, just not enough evidence with these new motors.
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