Hello friends! I would like to see my request here Post, since I cannot find a concrete answer anywhere.I have a lack of compression on all four cylinders with my VW TDI.Furthermore, he has lost power.On the other hand, I have found that the engine in the cold state pulls significantly better at least at low speed.Cold I do not kick it.Can this be related to the fact that the cold viscous motor oil better seals the calls and recesses in the cylinder walls than the warm thin motor oil? If I tip motor oil into the cylinders, the compression values will be better. Therefore, it would have to be possible to improve the compression or performance again with a thicker motor oil or not? I would like very much to get specific answers to my topic and please do not buy any tips like new engine or similar. Would be very grateful .