The gear that is on the side of the transmission has a small seal, where the speedo cable goes into the speedometer take-off unit. When the seal goes bad, the cable drags trans fluid up the inner core. I have changed this device several times for the same symptom. Replace the speedo unit on the side of the transmission.
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If it is a standard transmission, suspect the clutch master cylinder to be leaking clutch fluid internally. This fluid is usually clear in color. If it is green, suspect coolant leaking, possibly from the heater core inside the car on the passenger side. If the fluid is red and the vehicle is equipped with a speedometer cable,suspect transmission fluid traveling up the cable and dripping.
on the drivers side of the transmission under the car is a plug similar to a rear end in the older rear wheel drive cars bmw has
a lifetime tranny fluid setup so take out the plug and fluid should drip out its right behind the shifter cable if it dosent drip out youll need a pump to put it in you can get these at advance auto
YOUR CAR DONT HAVE DIP STICK.IT HAS A OIL FILLER CAP.YOUR NOW HAS TO BE PUT ON A CAR LIFT.AT DEALERSHIP.THEY HAVE TO RAISE IT UP.MAKE SURE IT IS LEVEL.THEY HAVE TO REMOVE A DRIP PLUG ON TRANSMISSION.CHECK FLUID WHILE ITS RUNNING.FLUID COMING OUT DRIP HOLE DETERMINE HOW MUCH FLUID IN TRANSMISSION.FAST DRIP MEANS TOO MUCH.SLOW DRIP LEVEL CORRECT.NO DRIP MEANS YOU NEED TO ADD TRANSMISSION FLUID.
newer cars dont have dip sticks.the is a filler cap there instead.most the new cars have to put on lift.level.there is drip plug on transmission has to be remove while car is on lift idling.if no drip you add tranny fluid.fast drip.you have too much fluid.if you get a slow drip your fluid level is good.place drip plug back in transmission.lower the car.
If transmission fluid is dripping off the bellhousing your torque converter seal is leaking or your transmission pump seal is leaking. Chances are the torque converter seal is leaking since the torque converter is spinning on it any time the engine is turning, the pump seal dosen't move it just keeps fluid inside the transmission. Even though it leaks with or without the engine running I'm willing to bet if you got underneath it with the engine running you will see it leaks more with the engine running. Now if either seal is leaking it will require the engine to be removed from the transmission to get to the seal. Sorry but this isn't going to be a cheap quick fix.
On 91 vehicles there's a 17mm allen screw on the side towards the left front wheel. Open it add the oil there on a level surface and fill till oil reaches the hole and starts coming out. DO NOT FILL OIL FROM THE TOP where what seems to be a plug. It's actually the timing marks and houses the clutch. Put oil there and you'll need a new clutch.