Did the plenum repair and since then I have had coolant in my oil. Not a milkshake consistency or anything, just really runny oil. Not sure if there's an issue with not applying enough sealant to the waterpump bolts, failed timing chain gasket, or improper installation of intake gasket. Any advice?

 

Any coolant getting into he oil is going to discolor it. If the oil still looks fairly black, and clean, then you just need to change it. If it is discolored at all, need to tear it down, and find out why.

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