Hello! I am new here. I recently acquired a used 88 300e with 116k miles on it. the problem is that the car has several oil leaks that are hard to locate. there is oil seeping from where the trans meets the block making it seem like a rear main seal. there is a plastic allen plug on the bottom of the trans and I'm wondering if it is really supposed to be there. I cleaned it up to get a better picture of the leaks origin. oil is also leaking down the block and around the trans from the rear passenger side of the motor. I spoke to a mechanic(on the phone) who said it is most likely the head gasket. the puzzling thing is that oil is dripping down the exhaust manifold and the intake manifold also. I removed the valve cover only to notice that it was never tightened down to begin with. I took it off and added some sealant to the gasket and tightened it down. the leak is still there so the valve cover could not be leaking. I'm clueless why oil would be in the exhaust man if this leak is related to the head gasket. any suggestions? where would be a good place to get affordable replacement parts? thanks for your help.