I recently started cleaning up my john deere B that my great grandfather purchased new in 1945. It has not ben used regularly since the 1970's. I started it and pulled it into the garage about 5 years ago. I just started to clean it up and try to get it in good running condition again. I pulled the drain plug on the motor oil and nothing came out, so I put my finger in the hole and its just solid Goo sludge like junk. I expected it to be nasty like milk but not like this. is there any way go get this junk out?