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Did you check the DLC for any stored codes? The only code that I can find for the transmission fluid using the lead in socket A1 is 2-3-5 which means the temperature of the fluid is too high. Did the transmission go into the limp home mode?
The only thing that comes to mind is that the transmission fluid cooler in the radiator could have sprung a leak, allowing antifreeze to enter into the cooler and mix with the transmission fluid. However, I don't know if the cooling system pressure is greater then the pressure that the transmission fluid is under when it passes through the transmission fluid cooler. It would have to be for my theory to be possible. And when the engine is cold, I know that the water pressure must be less then the transmission fluid pressure. Most likely, this isn't part of your problem. But stranger things have happened.
As for the oil light coming on, I believe that the light signals low pressure, not the actual level of the fluid. Did the light come on while driving or while stopped? If it was while stopped, it could indicate worn bearings and it probably would not be worth the expense to replace them. Either trade it in or drive it until it breaks.
I looked through the trouble codes I have and couldn't find one for the oil light. My guess (hopefully) would be either a faulty pressure sensor/wiring or oil diluted by fuel (rich mixture or incomplete combustion). That might be easy to correct.
If it is the oil pump, that is replacable like the water pump at the front of the engine.
Good Luck.
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Don 93 & 95 854 GLT, 95 855T
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