I am reposing my S8 post here hoping to get some more exposure.
I have always had dissapearing coolant in the S8. No visible leaks, expansion tank seems ok, no misfires and plugs look normal (black/sooty). I did a block tester check for CO2 in coolant, came back negative. Did a coolant pressure leakdown test. maintained 20 psi for 1 hr. No milkshake oil.
I put dye in the G13 coolant in the last maybe 500 km before taking the engine out.
Could this oil in the pan just be from spilled coolant and me turning the engine around on the stand a few times?
This still doesn’t answer where the coolant is going…
Link to pictures on crankcase internals.