I use Lucas fuel injection cleaner. I put it in every 4-5 tanks just to be sure my truck is running in tip top shape. There has never been any ill effects of doing it, so you shouldnt have a problem using it. Just be sure not to be cheap with what you get.
The Mercedes ML owners manual states that you should NOT use such additives... I normally use additives in my vehicles, however because I read this in my manual I have not used them in my ML. I do find myself always wanting to use them just to see what happens I just don't want to mess anything up in the fuel system. Does anyone out here know if any possible risks with using them in the ML?
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