My 1972 350SL, 71,000 miles has never leaked a drop of oil until taken to DEALER for a $140.00 fluid change. It now has a severe leak from the bellhousing. I thought the torque converer drain plug was leaking. When checking I noticed several gouge & scratch marks on the converter where it was pried with a screwdriver to rotate. Could this have caucsed damage to rear seal or converter?