The data: Omega B V6, Motor Y26SE, Bj 2000, Gearbox AR25 KZ DN, mileage 108500 km Last the vehicle was 6 months without moving it. The problem: In the cold start everything is good. The gearbox hardly switches through noticeably all gears cleanly. The whole thing up as well as down. Kickdown also no problem. With increasing temperature (so from 70°) there are switching problems between 2 and 3. When switching up it turns up partly high than if it were in idle. If one is short of the gas, it switches. Shutting down is then sometimes very roughy. It comes as a result also the MKL. Reading from the fault memory with TECH2 brought only the message “Unknown error” the following has been made so far: 1. Oil change with filter change. The oil was brown, roch almost ranzig but did not burn and had the appearance as if it had the full 16 years behind. Both on the magnet as well as in the two oil trays no traces of Spänen or other parts. Only light sludge from the Abrieb. After no improvement. After 100 km, the gear change has not stopped the oil band again neutral again.