I checked out my dipstick. I am a little low (no suprise there), but the engine oil is dark and shows no sign of water mixing. I usually use 10-30W Castrol GTX and reading the back of the bottle it does say that it has Detergent Action. Barring the grease from the water pump, what failure would result in a one way leak of oil into the Antifreeze but not the other way around?

As for blowby, from what I have seen from an extra B16 I have in the shed, you can't remove the oil pan on these things without first removing the flywheel. So replacing the rings would require removing the engine. My second B16 is in totally unknown condition, I picked it up from a local parts place for 70 bucks complete.

I guess I will start with a flush and an oil change, I had wanted to get my radiator rodded, but I wouldn't want to do that unless I had my oil mystery solved. No point gunking up a freshly cleaned radiator.

Thanks for your responses,

Mario m.