Originally Posted by Chris430s
Hello again a quick update and a question..
I went for redline 5w30 ester oil...put it on my car on may...and did around 2000 kilometers
Last week i got an engine code fault warning and after going to a dealer service workshop the code turned out to be a warning about slug-ash in the valves
My car has only 26000km and once a year i add a cleaning injection-valves additive on my fuel tank
Could this have been caused by the redline oil and not being a c2 spec oil?
Well it's a direct injection engine so a valve cleaning additive won't actually achieve anything. Your injection is occurring directly into the cylinder/combustion chamber whereas with older port injection style engines the injection happens in the inlet tract and the fuel air mix passes over the back of the valve helping to keep it clean. One issue some direct injection engines have is build up of ash in the inlet and on the back of valves normally from the PCV system venting back into the inlet. Given your car is modified this probably makes the issue worse. Higher blow by with more contaminants making there way into the sump and then back to the inlet.
I don't know enough about all the oil specs but I doubt the redline is the cause of this, I'd say it's simply a side effect of being direct injection and tuned for higher power. If the build up isn't too bad you can buy intake cleaners that get sprayed into your intake.