I appreciate the help given in discovering the existence of those oil filter O rings on my 82 240D. I went to the local Mercedes dealer to be sure to get the right size O rings without taking out the filter and going to the local auto parts store. I was pleasantly surprised when the parts man just handed me the O rings for free. When I went to remove the old ones, they truly just shattered, being so hard. In reading further threads, some people recommend Viton and other such O rings of special materials. I hope that what I got at the dealer is also very good quality.