What to do if wrong oil dipstick is being used & cannot read oil

The only way to know for sure is to remove the oil pan drain plug and drain the oil. Then refill the engine with the correct amount of oil. Then see what the dipstick reads. You might want to invest in the right dipstick tube and stick as one to short will cause you to overfill the engine and one to long will cause you to short the engine on oil and burn it up.

I would always go with the manual over what anybody else is telling you. But if you want to be sure you're putting in the right amount I find it best to use just slightly less than the quantity given in the manual as your starting point. So since it says 5.8 quarts, I would normally put about 5.5 quarts in. Then start the engine so that the oil gets pumped through everything and you'll get a more accurate oil level reading. Then use the dipstick to measure the oil level and see where it's at. Add more little by little until you're roughly in the middle of the min and max lines on the dipstick.

If your car with 5 speed automatic transmission there are special dipstick for it, it only have with dealers workshop, drive there and ask them need to check trans oil, if u found right dipstick you can check it your self, trans mission dipstick tube locate at back side the engine at right of middle, dipstick tube have covered by black cap with read lock, first you have to brake read lock and push remain read plastic lock inside the cap by small flat screw driver, and open cap, then keep engine running and check oil level if your car trans oil cold it should be the cold level on dipstick for check trans oil you must have better knowledge for that it mean oil level be deference and deference temperature better ask mechanic to check it, if your car have the 7speed trans mission you can't check oil level because it's need to plug diagnostics computer in to the your car and get trans oil in to 45 degree temperature, The oil temperature can check only diagnose CPU and also after rich the 45 degree temp need to open drain plug screw and check level for do this must need to get experience technicians service, is this information helped you?

That car takes 4.2 US quarts or 4 liters when you change the oil and filter. It takes 3.7 US quarts or 3.5 liters without the filter change.
Change the oil and mark the dipstick with a file so you know where the full mark is. Also that engine has 2 oil pressure switchs on top of the oil filter housing. If they aren't connected or faulty the oil light will come on. Hope this helps.

yes first remove the air cleaner housing witch is black plastic big housing with two air duct connect to front cross member pulling upwards have a look back right hand side the engine bay behind the engine you can see black small tube, it have covered by black cap with read lock you have to pull and brake read lock to open the cap some model have oil dipstick tube also near that be careful open the right one transmission dipstick tube shorter than oil dipstick tube you have to open shot one if you have good look you can see it's going to transmission or engine for adjust transmission oil you have to check transmission oil temp and you need right dipstick for that the dipstick only have with authorized Mercedes service center maybe could find from other workshops too not sure for check oil temp you need a diagnose cpu.

Not familiar with montero , but generaly speaking , automatic transmissions are filled , or toped up through the tube where the transmission dipstick is. Hope this helps. Make SURE you use the correct trans fluid , there are several different kinds. The recomended fluid is usualy marked on the dipstick.

4 Quarts including filter

This answer is completely wrong. The oil plug is under the car underneath the second plastic aero panel from the front of the car. Second, the 3.2 litre engine takes 8.5 quarts of oil and not 5 as this will be seriously under filled. Your compter display in your dash will tell you this when it beeps, turns red and reads, add more oil. It also alerts you when the oil has been overfilled because there is NO dipstick on this car. The only dipstick here is the one giving the wrong advise.

1) use the correct viscosity oil

2) Is the oil dipstick looks OEM. It may be a universal replacement.

Next time when you do oil change + filter. use the right amount of oil and check is where the dipstick read,

Stick with that level as FULL.

A replacement dipstick can be purchased at your local dealer. I suggest you get the right one and not try to fabricate a make shift one for something as critical as you engine oil level.