[sagarpadaki]

Mod Note : Please continue the discussion in our Engine Decarbonisation Article. Thanks

Originally Posted by sgiitk

The best decoking is a run of 30 minutes or so with the throttle open (as far as the law allows) on a highway.

Or you could rev in 3rd gear and maintain approx 80 kmph for a couple of minutes. The Egr and exhaust would be cleaned up pretty well.