My opinion, just having oil in it and changing regular is more important than the type. Modern oils are far superior to 50's stuff. I use modern 30wt in mine year round. Most fellas use 10w-40 now that I have seen on this list. Think the crud falling off with detergent is an old-wives tail....or is that an old-wrencher's tale? grin


G.L. Grumpy's
Old Iron Ranch
Huntington, IN 46750


MM R tractor, Speedex
and Power King tractors