Onan BFA Oil - Why not 20W-50?
Note: Our typical camping climate range runs from 10F to 115F (if we go to Redding, CA in the summer... otherwise up to about 105 in Southern Oregon.) Clearly Onan/Cummins have updated their recom...
Forum Discussion
To clarify one thing that non-aviation people may not understand. Aircraft oils are referenced by GRADES, and by WEIGHTS.
When MEX mentioned Aeroshell 80, 100 or 120 Those are GRADES, and that number is TWICE the WEIGHT of the oil. Thus he was referring to 40,50, and 60 WEIGHT oils. 60 weight is almost exclusively used in radial engines. In small aircraft horizontally opposed engines, 50 weight is most common, however small 4 and 6 cylinder Continental engines, the 75/85/90/100 hp four cylinders, and the 125/145 six cylinders should not be operated on 50 weight as ring problems will occur.
Charles
When MEX mentioned Aeroshell 80, 100 or 120 Those are GRADES, and that number is TWICE the WEIGHT of the oil. Thus he was referring to 40,50, and 60 WEIGHT oils. 60 weight is almost exclusively used in radial engines. In small aircraft horizontally opposed engines, 50 weight is most common, however small 4 and 6 cylinder Continental engines, the 75/85/90/100 hp four cylinders, and the 125/145 six cylinders should not be operated on 50 weight as ring problems will occur.
Charles
