M1
what you should do AFTER you replace the head gasket and carefully using a torque wrench with the proper rotation on the bolt pattern, is to flush the engine using an engine cleaner. Check the oil filter for metal shavings.
Then after you have flushed the engine, go ahead and fill the oil back up using a quality motor oil.
Anytime a headgasket blows is a concern.
Did you get or see any coolant in the oil?
What kind of vehicle is this and what is mileage?
Just curious...
micro...