Q: water in oil under cap on 2001 Chevrolet Silverado 1500

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there is water in oil under cap but not on dip stick, changed oil no sign of water in the drained oil, pressure usually around 60 but is at 40 now have to add a little coolant adout once a mounth but water has only been under cap for a few days, is blown head gasket only explanation or could it be something else
(2) Answers
May be normal from condensation, if the vehcle only makes short trips with out reaching operating temp. If not may want to check pcv valve, keep an eye on coolant level, leaking intake take manifold gaskets can cause oil and coolant cross contamination.
Could have had a little water in your oil, this is why quality oil costs more. I would get an oil change with an oil treatment to buffer.