I have an old Mako Purus compressor with about 50 hours on it. (see pics). It has not been run since about 1985, but was kept in a climate-controlled area, and everything looks good. I want to start it up to see if it runs so I can sell it, but I don't recall the oil mixture for the Sachs engine it has, and I'm afraid to start it without the proper oil mixture for the engine. I have the proper oil for the compressor, and the oil level is still good. Any suggestions?