In a gasoline engine I recommend adding fuel injector cleaner every month or two. Getting a fuel system flush every tune up also is a good idea. Especially if you buy your gas from an old or shaddy gas station.
In diesel engines I suggest adding a lubricity agent to your fuel at every fill up. I use dieselkleen by powerservice. Ultra low sulphur diesel is very poor a lubricating the injectors and its one of the most expensive repairs on those motors. You can also fill up with #2 diesel but its not usually available except at a few shell stations. Some diesel guys also add half a quart of ash free two stroke oil or seafoam to accomplish the same thing.
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