Why is engine oil discharging from exhaust pipe of a Mitsubishi pajero 2.8 turbo desiel intercooler?

it could be a few things that cause this either it is your piston rings have worn enough that combustion pressure is being pushed into the sump which is in turn pushing oil past the seals in the upper engine or your turbo has blown a seal and is pumping oil into the intake air charge do a compression test on your engine or goto a good mechanic and ask them to check the compression pressures. To check the turbo pull the low pressure hose off (the one that runs from the air cleaner to the turbo) first check the area around the engine breather pipe where it fits into this hose if there is only a fine mist of oil then go on to check the turbo if there is oil pooling in the intake side of the turbo then you will need a new turbo