my truck started to miss a little when idling but cleared up when I drove HI way speed but then it started to heat a little so I added coolant and it cooled off when I got home the motor was over full on the dipstick and the motor would not turn over.
Could you get coolant in your oil pan from a leaking intake manifold gasket? on 2005 Cadillac Escalade EXT
Yes, the intake gaskets can because right below the intake is the crankcase!! Do not try to crank the engine, have it towed to a repair shop, antifreeze WILL destory the bearings, hope it has not done so already. Also possible cracked cylinder head on 2001 through 2006 5.3 GM.
Sounds like the head gasket has gone bad and the coolant is leaking into the oil. Need to have a shop inspect.