That is a common problem with the vortec 350 engines. The intake manifold gasket starts leaking in the corners of it. That is where the water jackets are and it's only about 1/4 of an inch wide and when it starts leaking it allows engine coolant to leak into the lifter gallery and into the oil. Need to replace intake gasket as long as you no it did not freeze and crack the engine block.
Sounds like head gasket is leaking
Dealer item only, Sorry,,,,,,, Or salvage yard
the water pump gaskets start to leak (right or left, or both) and the coolant runs down the block to the oil pan/ block joint and appears to be coming from the oil pan. follow the leak closely, and you will probably see that it is coming from above the oil pan in the front.
You either need a head gasket or intake gasket.
Either a blown head gasket or a cracked block possibly
The coolant has oil in it. Possible causes are a failed headgasket, or a leaking oil cooler,
blown headgasket
You need a head gasket.
what weight oil used for 2004 Chevy silverado the standered is usually 5 w 30
"Where is the oil plug located for a 2008 Chevy silverado ext cab?"
5W30 oil.
In the oil pan