The gear change is very notchy on my Charade L251. The clutch failed in October 2021 and it took several weeks for the gear change the settle down after the transmission fluid had been changed. I often still have to declutch to get into 1st and reverse and the other changes are not what you call smooth. Is there anything I can do or do I just have to live with it? What is the optimum fluid for this gearbox? Is there an additive which might help? Any advice gratefully received.