Hi Guys, really need your advice. I am trying to find out what gearbox oil that should be used in my car. I have rang a MB dealer and they have advised it should be the 236.15(which is blue). But on looking into this abit more it seems that my vehicle which i believe has the 722.6 gearbox (could be wrong) should have the 236.14(which is red). I have had issues since the gearbox oil has been changed (has been done twice,each time with a different colour oil) so suspecting the wrong oil was used. I'm hoping a gearbox oil change and flush with the correct oil will solve my issues. Any advice greatly appreciated. TIA Alex