Low compression on No.4--Ideas ???

[WM-S12]

Inlet pipe to turbo removed - oil in turbo inlet.
Engine started, breather pipe removed from rocker cover - crankcase compression at the breather just with engine idling.
Spark plugs removed - number three plug burnt on deposits - burning oil in number three cylinder. Others burning clean.
Compression check carried out.
Compression (psi). 1 - 170, 2 - 170, 3 - 130, 4 - 100

Other turbo supplied has more play in the bearings than the one on the car.

Suggest problems are being caused by worn engine which requires further investigation / rectification before turbo is condemned.

thats the exact qouting from the guy at the garage I took my car to fix the apparant manifold problem.....turned out to be just the gasket so I bought a second hand tubby and manifold for £130....only needed the elbow and gaskets.....

As for smoke, my car barely smokes unless it sits for over 10 minutes idling below 700rpm some times nears 500rpm ( lol....chug chug ) but it's not belching out. Nor does it puff any when your belting it as the oil will simply be burnt all quicker.....really needs a new engine or atleast a rebuild.