1995 Buick Riviera Base 6 Cyl 3.80L
Have oil in radiator. Car not overheating no white smoke and loss of power going up hills and just stepping on the gas
Rpms stumble at idle and sometimes dies
The only way for engine oil to get into the cooling system at such a high degree is if you have a cracked block. even a blown head gasket doesn't allow that much oil into the coolant system. if the block was cracked it would be the water jackets around the cylinder walls. even a cracked head would not allow for this to occure. now if you don't have engine oil in the coolant but transmission oil instead via the trans oil cooler this would mean that the radiator has a crack in the tanks along the side where the coils of the oil cooler runs through it,(this only applys to vehicles that have an integral trans oil cooler). another thing that could occure is that the heads are cracked and the coolant is mixing with the oil in the upper oil galleys in the heads and then getting pumped through the intake into the bypass. if this were to occure your vehicle probably would not start at all and even if it did I seriously doubt it would stay running.