drove to mums, engine was hot. checked gearbox level while up on 1 side, and engine still running. started coming out after about 200ml so when i lowered i lost about the same as i put in. went for a drive and gears changed ok but i noticed it wouldnt go above 3rd gear. last friday i dropped both sumps and i reckon about 7 litres came out in all. clean both sumps, put new filter on and new gaskets and replaced. put 5 litres in and started the engine let run till engine got to 80 then topped up, got another litre in then lowered and let excess fall out while running and jacked up and put nut back on. when i cleaned the selector switch i took apart and cleaned all the crap out and put back on in the same position i took it off. no gearbox codes stored. so i must have to take the selector off again and make sure its in the correct position, would this be why its not using all the gears ??