Gearbox oil level rising and engine oil lowers

Do you smell gasoline in the oil? If you do the diaphragm in the engine transfer pump is leaking. You have to determine why the oil level is rising in order to find the cause.

If the oil level is going up then it's possible you have water getting into the oil, perhaps you have a blown head gasket. Have a compression test done immediately.

Hi Arlene, Open the hood and check the oil level in the gear box. The oil can be checked on the dip stick which is fitted into the gearbox. The level is checked with the engine running and the parking brake fully applied and the selector lever in 'N' On the dip stick there are four marks. The fluid level must be between the two lower levels if the engine has just been started and if it has warmed to operating temperature it should be between the upper marks. If the oil level is correct, the gearbox has a problem. Regards John

If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:



The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):


(In the picture above the transmission oil pan was removed for oil filter replacement).

hi from uk if memory serves ?the g/box oil level/filler plug is-- as you open the hood/bonnet in uk then look down at the gearbox on the front side behind radiator the filler plug is half way down in the center of g/box the filler is a hexagonal heade nut and the size of wrench needed is 17 or 19 mm ?? the level is correct if when you remove plug the oil is at the lower end of hole hope this helps ?

Assuming you have made sure your oil level is full, I would replace the oil pressure sending unit. The sending unit is located right next to the oil filter on the lower left side of the engine. If I recall it's right on the filter attachment housing. You'll see the sending wire attached to it.

That is the fastest, cheapest and most likely solution.

if it has a dip stick under the bonnet you need to have the engine running with the box in neutral then dip the oil
if the engine is warm then it should read around the top mark, if the engine us cold then it should rear around the lower mark
if there is no dip stick then there is no way of checking the level and you will need to drain the box and re fill with the correct ammount through the gearbox breather on the top

locate the filler plug on the lower front side of the transmission housing unscrew it with an allen key if the oil is low top up until it runs back out the filler hole. this is for manual transmission

use 15w-40 for the engine, ATF for the gearbox and 80w-90 for the diffs and transfer box. engine and gearbox have dipsticks for the levels, the diffs and transfer box have removable plugs for level checking, fill until the fluid comes out the level plug.

hi from uk if your oil ? leak is from rear of engine area ? but you say oil level in engine is ok? and not needed to top up ? then i would check the gearbox/transmission oil level? for any loss? asap it may be your leak is coming from g/box/transmission front seal ? but either way gearbox will have to come out do be able to replace both rear engine crank seal and g/box front seal at the same time ? hope this helps you don;t delay in topping oil level in trans ?