Hi all. 

I have just changed my diverter valve on my 04 1.8t vrs as the old one was causing a tiny bot of compressor stall. On removal I found this horrible not quite oil like residue on the hose barb ends. its a standard bosch one. any one come across this before. car is running fine without smoke. The inside of the valve is not oily and the inside of the hoses are a bit sooty but nothing more than I expected from a 140k car that has never been cleaned out.  Its also had a remap if that makes any difference. standard air-box and piper cross panel filter. Could someone have siliconed the hose barbs to put the hoses back on. the valve has been changed at some point prior to my ownership as the single use clips have been replaced with jubalie clips. 

any help would be welcome. 

Hopefully its not bad as i have just bought Koni dampers and H&R springs form DPM with a bushing kit. 

Thanks

A

Hi,

If you continue using the standard breather set up this will occur. The engine recirculates crank case gasses and via a series of  oneway valves feeds the oil/air fumes back into the engine to be burned in combustion (called a closed system).

This is why many owners, including myself, have fitted a oil catch can (OCC), its purpose is to separate out the oily fumes so cleaner air is returned into the system. Do a few searches you will be surprised the amount and quality of the crap that is filtered out.

Also the oily air, I read somewhere, can slightly lower the octane rating, dont know if thats true but it does sound possible.

 

Regarding the amount of deposits you found and taking your engines mileage into account I would suggest its nothing to worry about, an OCC is a mod I would consider for the future. There are a few how - to posts on here with many pics included.

 

Good Luck

 

Peter

Edited 7 January, 201610 yr by Silver Bullet

Thanks very much. Ill look into it.