[GTP Dad]

On some high mileage engines this will happen. It takes a little while for the oil pressure to build to a certain level. If you are using a heavy weight oil and the weather is cold this will happen. As long as the oil light goes out you should be fine although I think I would examine the weight of oil I was using and see if it is proper for the outside temperature. You may also want to change the oil pressure sending unit as it may be partially plugged from sludge and is not registering properly.

Welcome to AF!!