The second thing I had to say was that I had to change the spark plugs with my V70 Bj 99 and 400,000 km, because the engine was running unround and not quiet. After I had the cover down, everything swam in a small oil pool (except for the outer cylinders). I took the oil with a cloth and then saw that these small cable hoses (black and so ripped) were completely porous and at 90% of the places were blown away. This rest I blew out with compressed air before I put off the connection to the spark plugs. Unfortunately, the workshop did not do that at the last change. In all spark plug shafts there was too much brute stuff. I blew it out with compressed air so well, but also under the sealings of the candles it was already, of course nicely stuck. I did not trust now with the open access to the combustion room to get too strong and first the new candles so screwed up. First question: Did someone have a good idea how to clean up that there? Can the bad run of the oil just come off of course.