the other day I decided to change my gearbox oil because my 4th and 5th gear was popping out when driving and I used synthetic 75w90 gear oil which was recommended to use from another thread I read. now after I finished draining all the old oil and very black in color. I put in the new oil and went for a drive everything was working great I was happy. went to visit a friend and parked the car for about an hour. I went to drive home no problem shifting up or down but about 10 km into the drive home I tried to downshift from 3rd to 2nd and it could not go in then went back to 3rd no problem then tried to up-shift to 4th problem getting it in then I pulled over and tried to put into 1st gear and could not get it in, the only gear I could get in was 3rd gear nothing else worked. had to drive the B in 3rd gear all the way home about 30 km thank god for that, I got it home and parked in the garage next day I started it up again and tried to put it into the gears and nothing could not get it into any gears except 3rd gear I'm thinking it might be the synchronizes in the gear box. not sure but I have 1997 with 67000 km. and I've only put on about 1000 km since I bought it last year. can anyone please let me know what the hell is going on here thank you
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