Decarbonisation for GTI Mk6 at 2 year service?

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Originally Posted by Mountainman

Is this the same as the upper engine cleaner that Subaru use as part of every scheduled service? It costs around $17 and comes out of a can.

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Similar although this was because of Subaru's boxer engines and their design rather than anything else. And let's be honest, VW are not the only ones with DI engines and do other people ask for this? It's probably a nice to have if you have money, and not necessary. BIt like cleaning your car every week. Nice to have but car is still going to work - just looks worse after a few years.

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Originally Posted by Bora Sport

I have no experience with DI engines however I can tell you that my local VW dealer has been trying to sell me this for the last 8 years and I personally think it is a blatant money grab. I pulled the head off my Vento at around 360,000k's

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Your Vento isn't Direct Injection, so you are correct as the fuel is injected before the valve & the solvent properties would help keep it relatively clean.

DI injects straight into the cylinder, therefore the inlet doesn't get any solvents & depending on driving style, PCV, etc you could get a fairly hefty build-up of carbon on the inlet.

Something like this:
http://www.vwwatercooled.com.au/foru...SDC11716-1.jpg

Spot on. Explain to me how a spray is going to remove baked on carbon, let alone a mm or two of gunge PCV/egr oily sludge mix.

Will help, and better than nothing, but you eiother ignore it, physically clean it, or get a catch can of some sort. Even that doesn't totally stop it.....even your turbo is a total oil loss bearing....

Since any carbon build up in a DI engine is going to be sourced from oil mist from the PCV or turbo bearing, surely the Very Expensive VW approved oil would be formulated to address this problem?

If it is an issue with MK6 golfs, I'd want to see some dismantling done for $185.

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Originally Posted by rossw

Since any carbon build up in a DI engine is going to be sourced from oil mist from the PCV or turbo bearing, surely the Very Expensive VW approved oil would be formulated to address this problem?

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That's one of the aims, yes.

A field test conducted by Lubrizol has shown that deposits on the intake valve and EGR increase significantly in DI engines when using conventional Euro 3 type oils, as opposed to using Euro 4 type oils (i.e. lower SAPS) such VW 504/507.

Now I can't confirm if that alone can eliminate the problem entirely, but it is certainly one the easier methods to try out!


In regards to cost, unless you are happy being charged $25/litre, you can easily find cheaper alternatives in stores or online.

If you have seen the full new range of VW engines due for release, you will see what they have done to solve the issue - anyone have a guess as to what they have done?

Ok, my guess is a 5th injector in the throttle body..

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Originally Posted by Guy_H

If you have seen the full new range of VW engines due for release, you will see what they have done to solve the issue - anyone have a guess as to what they have done?

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second set of injectors and fuel rail
Im interested to see how the fuel system is before that and how its split

Sebs got it! - it's a new split fuel system, from the technical documents, the port injection is transitional "low" pressure.

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Originally Posted by Guy_H

Sebs got it! - it's a new split fuel system, from the technical documents, the port injection is transitional "low" pressure.

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Wait , what ? Thats Courtney that posted , although I knew about what they were doing a few years back .VW/Audi never aknowledged it was an issue publicly but they changed the injection design back to conventional multi-point and kept direct injection ! Expensive learning curve where 10 years worth of FSI cars will suffer issues !