SOURCE: 2002 Chevy Avalanche Oil Pump
oil pump is on front of engine you ewill need to pull crank pulley and fan shroud.
SOURCE: 1994 buick regal
More than likely (and we will hope) it is the oil sending unit. In comparison it is a very cheap and quick fix to replacing the oil pump. Auto Zone has a pretty good componet location section that has tips for replacement if you cant find the sending unit or the oil pump. Try that first it may save you a lot of work.
Still can be a cracked head gasket. Unless you are creating to much pressure in your engine. Just because you do not see any oil leaks does not mean that the head gasket could not be cracked
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