[veedubmechanic]

check the pcv and breather lines. Its the large 1in piple that goes from the intake pipe (a circle valve) to the valve cover, then under the intake manifold to the block. they are a common failure arround 50-70k miles on 1.8t. its about 500.00 for parts (new thicker rubber pipes last longer) plus install. they will look like theres oil on the breather lines or wet dirt