My nissan x-trail leaks with engine oil underneath between the engine and the transmission when it's running, what seems to be the problem?

oil leaks from underneath can come from front crank shaft seal --rear crank shaft seal --oil filter--sump gasket---power steering ---leaking rocker cover gaskets ---leaking oil pressure switch.--transmission seals. I suggest that you have the engine professionally cleaned and then put it on a hoist while running to see where the oil is from

Your radiator needs to be replaced. Chances are you have transmission and oil cooler lines going through them and there are mixing inside the radiator.

the only way you lose oil is by burning it or leaking it, if your car blows a lot of blue smoke, then you are burning it {engine rebuild or replace} if there is oil on the ground when you park, then you need to determine where the leak is coming from, pressure wash underneath before taking it to a mechanic, we hate getting under dripping dirty cars. glad to help.

Hi
Its in the engine oil filer cap. its part of it
thank

valve cover gaskets, dip stick tube broken at the bottom, oil filter,
or; the block can be cracked. Good luck with this one.

TRANSMISSION FLUID LEAKS,CAN BE FOUND AROUND PAN GASKET.CHECK PAN GASKET,IF IT LOOKS WET AND YOU SEE FLUID DRIPPING AROUND THE EDGE OF OIL PAN, REPLACE PAN GASKET, WHILE YOU REPLACING PAN GASKET REPLACE TRANSMISSION FILTER WHILE OIL PAN OFF.IF TRANSMISSION OIL PAN NOT LEAKING, CHECK TRANSMISSION OIL COOLER LINES GOING INTO RADIATOR YOU WILL LOOSE A LOT OF FLUID THERE ALSO TORQUE SHAFT SEAL WILL CAUSE HEAVY FLUID LEAK WHILE ENGINE RUNNING CHECK OIL COOLER LINES AND LOOK AT THE TORQUE AREA WHILE ENGINE RUNNING YOU WILL SEE FLUID POURING WHILE ENGINE RUNNING THE OIL PUMP PRESSURE WILL PUSH FLUID OUT AT THE LEAKING AREAS.

HI. This may be a oil pan gasket issue. The gasket is facing downward towards the ground, so the leaking oil in this area would not necessarily touch the enigne block. It would actually run down the sides of the bottom section of the oil pan and the rim areas. Also; make sure that it is indeed engien oil. It may be transmission fluid or power sterring fluid, as well. Raise the vehicle or slide under the frame to take a closer look at the oil and transmissin pans to locate the actual leak point.

In most cases of this nature, it will be either the transmission pan gasket or oil pan gasket that will be the culprit.

Oil leak can be attributed to several factors.
1. Gasket failure.
2. Uncontrolled Crank case pressure Failure.

RECOMENDATION:
Tighten both the valve cover and oil pan bolts.
Replace the Positive Crankcase Ventilation Valve and vacuum line.,

INFO: PCV
This is a valve causes a negative vacuum on the engine while its running, As to say if it had a leak in a valve cover it should not be leaking while its running, only when the engine it turned off.

Hope this tip guides you in the correct direction to solve this problem.

R/
David

the transmission oil cooler is on the lower part of the radiator. it might have a hole inside. you need to replace the radiator and flush the transmission fluid several times