Probably a blown head gasket/warped head, cracked head or cracked block.
blown head gasket
intake manifold gasket if it is coolant in the oil
white smoke from coolant usually indicates oil in coolant,this usually means a blown headgasket
Blown head gasket will do it check your coolant for oil in it and your engine oil for coolant it it...
you mean there is coolant in the oil or oil in the coolant either ways sounds like a head gasket problem.
head gasket is leaking into oil
Head gasket & oil cooler
Head gasket & oil cooler
Hard driving can cause an engine to use oil, but not drastically. Coolant level should not be effected unless the engine overheats.
There are a couple of things that can cause oil to get into your coolant reservoir. A blown head gasket or a broken piston ring are the most common causes.
No, only a blown head gasket or cracked head will cause coolant to mix with the oil. A leaking valve cover gasket will only cause oil to leak onto the engine block externally.
There's more than one cause of oil in engine coolant but the most common is a blown (failed) head gasket.