i was about to buy an injector cleaning tool (they actually are an in-car tool you don't need to remove), but it dawned on me in most of four years ive never run injector cleaner through either of our cars which were both kicking in SES sporadically but too often.

Put in half a tank of gas in each car, reset codes, no codes either car in a month. I did a nice long drive each car at least an hour to 90 minutes after putting in the Lucas cleaner.

I could feel the difference in throttle response within ten minutes of driving it was clearly making a difference.

I think I'll add to my regular maintenance probably six month interval including just before winter since those cold starts are the hardest on the engine.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)