Showshow much the tech never any coolant line to any TDI turbo ever. Only gas models. TDI= oil cooled only. The EGR cooler could leak coolant and go back into the intake through the EGR. Remove the intercooler and pressure test it underwater. Only other place coolant sees intake is the EGR cooler. Now for the other - oil leaks from the turbo. Ordinarily the only leakage happens inside the plumbing. If there's oil coming from the outside, there would be 4 sources: 1) loose or cracked oil supply line connection (s), 2) loose or cracked oil drain connection (s), 3) leak at intake or exhaust plumbing connections (if it is dripping there Thecost to repair an oil leak depends on how many hours of labor are required to access it and its complexity. In general, expect to pay in parts and labor, $100-$350 to replace the oil drain plug gasket; $427-$512 to replace the oil pan gasket; $217-$263 to replace valve cover gaskets, and $650-$850 to replace the rear crankshaft seal. 1Check the hoses that go from the Vacuum Pump to Brake Master Cylinder for cracks. 2-Maybe the hose is now so expanded, yours is an old car, that there is not a perfect seal any longer. If it is leaking you can see easily see the oil. If the Brake Pedal is hard the Vacuum Pump is the culprit. It has an Air Leak. spah 298 posts · Joined 2010. #2 · Oct 31, 2013. If you're seeing lots of oil through the pcv then it will work its way into the egr. Also, mixing with the hot egr gasses it will create buildup. You can add a catch can (provent 200 is very popular) that will remove pretty much all of the oil from your crank breather. Isuggest leaving the EGR system intact for legal reasons and emissions. For more EGR information, see 1000q: TDI EGR system FAQ. Excess buildup can also cause the anti-shudder valve to stick in the closed position, cutting off air to the engine and resulting in a no-start condition. TDI 2015 Passat TDI. Nov 10, 2020. #1. I've been trying to research this oil leak of mine, narrowed it down to a few things. I have a 2015 Passat tdi with 76k miles. Over the last 15k miles, I noticed I've been losing some oil. Began with about a quart the first 10k, then got worse lately with a quart during the last 5k. TheEGR valve was slowing leaking oil out of the two vent holes at the top. After reading some forums this suggested the EGR valve was faulty. Found a brand new genuine VAG one for £100 on ebay and fitted it after taking off and cleaning the intake manifold for good measure. Audi a4: turbo..1.9 valve and turdo intake 2006Jetta TDI, 2002 Eurovan Westphalia VR6. Jan 13, 2012. #2. EGR doesn't have to come out but the EGR cooler does. Turbo will come out the bottom of the car with the cooler pulled. IIRC pulling the passenger side axle might be necessary too. It has been awhile but you may be able to get away with just unbolting the inner flange of TimScott June 1, 2016 at 8:18 pm - Reply. No, it will not. Stop leak is usually a rubber seal expansion agent . The leaking is coming from steal piston rings. Leaky seals are usually secondary damage. Tim Scott January 5, 2017 at 8:14 pm - Reply. No it will not. Stop leak is usually a rubber seal additive. The oil seals in the turbocharger are aH4E.