w220: s 320 cdi: Oil loss on rear axle and heater heats and heats

Hello together, last week I had a problem with sudden smoke generation in the stand with warm engine. A check in the workshop showed that everything was quite normal, just the heater squeak so, but I would know that… well, thank God not, but the car actually does not heat up more than 80 degrees, which is why next week some thermostat is replaced, then it should go again. However, I was noticed an oil loss at the back repair costs with exchange of the Simmering ca. 520€, kulanz application rejected (on 16.12.2004). The car is year 5/01, I am first owner, all inspections after DC intervals in contract workshop, 103TKM. I had Kulanz clarified beforehand, therefore I have not yet given an order. Legally I can do nothing about this, therefore need material from similar cases in which Kulanz was paid. At my home place I find no fresh oil stains, so does not seem to trop If you could help me by e-mail or give me other tips, I would like to thank you in advance. I found only one post here in the forum with another person affected:http://www.motor-talk.de/t460061/f77/s/thread.html Wishing everyone an accident-free, healthy, peaceful Christmas season. Thomas