In a 4.3L engine, the intake manifold gasket ruptured letting engine coolant mix with the oil. We have removed the manifold and cleaned what we could.
My plan is after putting the upper back together, I will add synthetic 5W-30 with a new oil filter, get it running to go about 200 miles, then do an oil & filter change. Then go about 1,000 miles before the next oil & filter change. Then drive the normal recommended miles before the next oil & filter change.
My question is how to dry out any remaining coolant? Should Sea Foam be added to the oil at initial 200 miles, the 1,000 mile phase? Or what would Sea Foam’s recommendation be?
Hi Randall. Thanks for reaching out to us!
Using your imagination here, understand that radiator coolant is water-based and heavier than petroleum motor oil, so will not blend with the engine oil. When you run the engine, any leftover coolant liquid that might be in the crankcase will emulsify/churn with the motor oil, allowing 100% of the coolant to be temporarily suspended in the motor oil liquid. Once you stop running the engine and let things sit for a bit, the coolant will separate from the oil and settle somewhere under the oil.
What I’d do:
Hope this helps!