850, Bj 94, km 280ooo. I passed my 2nd Volvo, in April with new Tüv and ASU without complaint. Now I notice strong oil consumption, at least 1 liter on 1000km.The oil tank is wet, but that’s because of the Simmering. Curve shaft,(I think) was already before. Now the engine runs after about 5 min. in idle only on 4 zyl, after about 10km it is free again. Presumably piston rings of a yl. defective.Maybe shaft seal?. It also does not squelch strongly when accelerating, highest What do you do?