2010 glk 350 what can I do to improve engine performance?
Why not start with spark plugs, injector cleaner, fuel and air filters, clean the mass air flow sensor, clean the throttle body, correct spec synthetic oil change, and run premium fuel always. Also note that older exhaust components will be getting full of crap after about ten years. You may benefit from a new cat converter and oxygen sensors.
Might not be cheap, but all of the above are meant to restore the power and performance your MB left the factory with. Taken care of properly it’s no slouch.
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OP: spend your money however you wish. If it was me, I’d get caught up on all maintenance and run diagnostics to make sure everything is performing per specs.
If your GLK is slow, something ain’t right. Even stock they put out about 270hp (later models 300hp I believe) and that’s plenty quick.









