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Update
TLDR oil still shows in coolant. scoop oil out from expansion but oil still shows. had shop pressurize oil/coolant system. shop said pressure remained constant. Any other way to determine if head is cracked without dropping engine?
spent a whole day flushing the system with simple green. Must have done 5 flushes. By the last flush, liquid was looking clean with the exception of a few tiny specs of oil. Expansion tank was spotless. Few days later i see oil return to the expansion tank. The oil is at the surface and can be scooped out. Once the water/coolant is visible it almost looks clean. I've been cleaning the oil from the surface every time after driving and have done some 2 "lazy flushes" (draining only engine coolant/puling the return hose to drain but after every drive oil appears at the surface.
I had a different shop pressurize both coolant(15-20PSI) & oil systems but they told me pressure remained constant.
Either I didn't flush the system well enough, or the cracked head doesn't open up until engine is warm.
Car is a 2000 S 118K miles manual. no overheat, smoke or drivability issues. I've already accepted the worse but would like some assurance before dropping engine/removing heads. Any guidance from the pros?
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