Audi Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'm Brandon - Audi tech.
The brown sludge has lot to do with short trip interval.
When was the last time you have an oil change?
Typically the PCV valve is clogged or dirty which build up the brown sludge.
It looks like this in the above link. It cost about $280.
Labor is 1.4 labor hours.
Please rate me positive for the prompt service, thank you!
Ok, I got it. That will be different. It sounds like a cylinder head gasket damaged.
There are two test you could confirm if is the cylinder head gasket. Will you be doing the test?
1. The easy fast test is to start your engine and see if there is bubble coming up in the coolant tank. If you see lot of bubble that means the head gasket is damaged. Also if you see heavy white smoke from the exhaust. That is also an indicator.
There is a kit out there to check if there is combustion gas leak inside the coolant system.