I have a 1993 mazda 626 4 cyl. on a cold startup the engine smokes then goes away after hot. I have replaced the valve stem seals checked pvc and egr valves all ok. oil is getting into cylinders 2 & 3 when setting overnight please tell me what you think the problem is.

Optional Information:
1993 Mazda 626 2.0 4 cyl.

Already Tried:
valve stem seals, head gasket, egr valve, pcv valve, oil change, stop smoke additive.