As I said I started by changing the sparkplugs, the old one was realy bad. I filled the petroltank with STP injector cleaning fluid. That helped, less smoke and the enging worked little better. Today I used the oil treatment from Wurth. I drove the engine hot then filled the treatment fluid into the oil. I let the car running for 15 minutes then drained the oil. The oil was realy black and some partikles came out to. I used a MAN filter and Valvoline 20-50 Racing oil Mineral, I did not find the Castrol oil you recomendet me Roadcrew but the Valvoline 20-50 is to thick for the norwegian winters so i wil find the Castrol and try that before winter. The result with the Valvoline was good, full oil presure at once and allmost no smoke so my "7" and I am happy
