I use water only lol. Drive at high rpm for a while until engine hot, then stop. Stuck the throttle pedal with floor mat to keep it rev until 2500rpm. Open hood, cabut brake booster and then spray water inside brake booster hose.. Then you can feel with your hand the exhaust churning out water mist. I use around 300 to 500ml of water. If you scare then maybe 100ml is enough. . Then, after that, drive the car around within 4000rpm to redline. At first you car feel like want to stall. So put lower gear to high rev. My car already clock 193k km and its a GDI engine. Never done overhaul yet. Cheaper than seafom lol.

Can google engine water decarbo.
Just dont spray the water until your engine die. Keep it rev high that its strong enough to transform the water from liquid to vapor.. If not it can cause hydrolock.

BMW M4 also got this water injection kit stock from factory. But its for performance purpose la.

This post has been edited by Ikmal404: Jul 3 2019, 08:05 PM

Done this countless of time.
Never had problem.. 193k now. Mind you it's GDI engine... So carbon build up is common.

After do this, engine become quiet and no more sluggish.

Yup. The key is to make sure the engine is hot. Trash the engine for 15 minute on freeway, 4000 to 5000 rpm. Then after that can do water decarbo.

This post has been edited by Ikmal404: Jul 3 2019, 07:47 PM

Save money lol. Water only.

This post has been edited by Ikmal404: Jul 3 2019, 07:52 PM