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I'm actually the 5th owner. My car was owned by BMW, then 3 other people. It didn't have one owner for very long.
I refilled the transmission with Pentosin MTF-2 in the end, and used Motul 300 gear oil for the diff. Maybe I'll do another change next weekend. What would I expect/not expect to see after the second change?
I'd imagine there would be fold particles in the oil regardless of use, as the synchros will always wear with use, and this is still the original fluid from when the car was new.
As it's so easy I might start changing the trans fluid yearly, just to be safe.
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