Greetings. I have a problem with the valve shaft seals of an x30xe in the Omega B Facelift. To the chronology of the gray hair. I bought an Omega B Caravan automatic with almost 153TKM and head seal damage year end 2000. At home then these changed, with the valves all newly sanded, new shaft seals, new hydros, new belts, new water pump, all handled without complaints and screwed together. (with the help of TIS) After timing belt adjust motor to …….. Runs….. Engine gets warm short gas bursts on 2500U/min….. Blue smoke from side seat. (well to recognize because rear silencer does not eat yet) I then searched around here what could explain otherwise for possible problems. Blow By System I immediately participated in the course of the head seals. So cleaned and an impact plate rented into the KGE. At the engine run I have to look for clear hoses mounted from the KGE to the intake tract. There comes no oil, so i So the oil comes from the head area. I then picked up the tip in a contribution from the Omega God “Kurt” for quality seals. I then on the right bench in the built-in state exchanged the Viktor Renz shaft seals for Elring. I noticed three loose shaft seals. Then everything again together and adjusted. Engine on…… Runs….. warm short gas…….blue smoke….the dirt.. So the same, oil loss eats so much that it me between cat tube Well, engine once warm, securing pulled off the fuel pump and compression test made on the right bench. Cylinder 1,3,5 all in the range 13 bar. Next day in cold engine pressure loss test. No findings. Very small loss. Wherever. Cylinder bushings look good, pistons are chic, I had made head first and head seals also. I took the head down again and disassembled. And again three shaft seals loose. Mal e How can this be that it loosens the valve shaft seals. Yes, I pressed it firmly with my hand the first time, the second time with a hard rubber hammer, slightly knocked on with a splattering tool for shaft seals. Would be very grateful for thinkers.