Moin Moin, after almost 10 years (without maintenance) and 180,000 km on gas, for the first time a major intervention on my gas system was carried out. The reason for this operation was a restless motor run in gas operation. In the cold condition the engine even went out. In switching operations this is no fun. After about 10-15 km the spook was then over and the engine ran without problems in gas operation. Due to this symptom I started from a temperature problem. I got a sealing set, cleaned the evaporator disassembled and reassembled. The membrane which separates the water-bearing part from the gas-bearing part was quite washed out and a replacement was bitterly necessary. The other membranes looked still very good. All in all, the story took about 3.5 hours, whereby only the replacement of the resins/cokings on all moving and fixed parts of the evaporator has taken about 2 hours. At the disintegration I even pushed on the gas filter which was never changed. If this time I know where to find it is. Otherwise, the evaporator is built up quite easily. My effort is again.