The car has 90K miles, change oil every 5K miles, at last oil change, mechanic noticed oil leaking from the turbo and an air line running to the turbo had oil in it. Any ideas on where the oil is coming from, other than the turbo? Is this a common problem? If it is the turbo, rebuild or replace with new part? Thanks Thanks
Oil leak coming from the turbo on 2009 Volkswagen Jetta TDI
by rpeder in Pasadena, CA on September 10, 2013
ANSWER by Karmakanix , November 29, 2014
Could have faulty valve cover. Has several sorts of PCV valves inside, kinda complicated. If the high pressure valve is sticking, the crankcase builds up pressure. So does the tiny crankcase of the turbo, forcing oil out. We use a pressure gauge made onto an oil cap, then check the crankcase pressure while driving. Could have a bad turbo. Take off the intake boot / pipe from the turbo inlet. Check if the turbo has more than .020" of side play at the nut on the end of the shaft. Also check for damage to the impeller blades. We don't replace the turbos for just being loose. But if you are documenting oil consumption over 1 qt in 2000 miles, and the PCV pressure is normal, then perhaps a turbo is in order. Take off the high pressure EGR pipe at the valve on the intake manifold. The EGR comes out of the manifold before the turbo. If it has oil in the carbon, then the engine itself may be suspect. There is a measuring block, #141 that gives the actual running compression in bar (barometric actual pressure). Check to see if there is a variance of more than 2 bar. The sight of oil seeping from a turbo pipe is not cause for repair. Check and document the actual oil consumption.