Dave W ……most scary drive of my life was on the M6 back to London . We had visited a friend in Lancashire for some reason went in the Kangoo.
I noticed a bit of an ‘oil’ puddle on our friends drive whilst visiting and after leaving the car started to jump out of gear at about 55/60 mph. Stop and start again and it went for a few miles but jumped out of gear regularly If I kept about 45 it seemed to be OK, no jumping out of gear but the drive down the M6 and M40 in the evening and night at that speed was frightening. Lorries bearing down on us for many hours.
Did think about staying over but now it was after midnight and still very busy Got back home in the early hours in one piece and took it to a gearbox place that had rebuilt a Santa Fe box for me , so I had an idea of the cost !
The gearbox is a sealed for life box but he said let’s change the oil. Cost £20 as a favour and has been fine for the last 3 years - no problem !

Seems to adhere to your theory Dave !
Best MM
PS Going to Dachau concentration camp tomorrow……as a Boomer I feel I must show respect . We intend to visit Ypres area also on the drive back .