I recently bought my 98 cobra back from the guy I sold it to. I don't think he ever changed or added oil to the Kenne Bell. Pulled the dip stick and it is dry and caked with burnt oil. I pulled the blower and the drain plug. Barely any oil came out. What did come out wasn't discolored thankfully. What can I use to safely it flush out? I have plenty of oil to run though it once I get it clean. All help is welcome.