A short time ago he had an alternator replacement. He had to take out the drive shaft. Here a bit of gear oil ran out. A short time later it started that I sometimes could not get the reverse gear, the first gear or even occasionally the second gear. Now I ask myself is the clutch worn (131000) or is there perhaps too little gear oil in it? How can I control the oil level, I think under the battery holder you can refill gear oil (which?), right? Who k ann da help, thank you in advance says Jürgen