Hello, soon the installation of new gaskets for the oil cooler is on my mocha. I had removed the exhaust manifold the other day already ( went easily without torn screws). I used the nuts again. ( new gaskets of course installed ). Can I just use them again or are there any problems? I always find only these copper nuts, the factory side are not. Should the new gaskets be lubricated with silicone grease or just everything dry In the Youtube videos it looks so fuzzy to reintroduce the small adjustable tube. I already have the sealing kit there (Elring 599.160 )