Hello Dave,
I suspect that the oil leak is coming from somewhere else, but depositing itself all over the surface of the resonator.
My BIL bought a 2006 60th Anniversary Commander not long ago and the whole resonator area was just covered in oil.
At first I suspected it was the rubber O ring where turbo outlet metal pipe connects to the resonator that may have failed, causing from the turbo output to leak onto the resonator.
So I dismantled the resonator, but the O ring was intact, and there did not appear to be much oil at all inside the resonator itself. I sloshed petrol thru the resonator several times to clear out it's insides, gave it a good clean up, and made a conclusion that the plastic resonator is NOT likely to be porous.
What I did find was that the turbo inlet hose was the original design, which has the orange seal. There was evidence of oil leaking from the seal where the inlet hose meets the turbo, which would have come from the crankcase vent hose.
I replaced the turbo inlet hose with a new one, and liberally sprayed every part of the engine that was greasy with degreaser (carefully avoiding the alternator). I also liberally emptied two cans of degreaser into the Vee area of the top of the engine, as this is an area where oil can pool. I then rinsed off all the degreaser with a low pressure garden hose.
It's now been a couple of months, and the plastic resonator is still as clean as a whistle on the outside at least.
Will be installing an oil catch can to stop crankcase vapours getting sucked into the turbo.
I also pulled out the intercooler and gave it a clean with petrol. I had expected it to be half full of engine oil, but surprisingly, there was hardly any oil in it. In the end it wasn't worth the effort of pulling out the intercooler, as it meant removing the cranking battery to be able to disconnect the intercooler inlet hose.
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