I just restored my Farmall Super A and need some advice. I have read that any oil of the correct weight for the temperature can be used in this tractor. This includes detergent oil of many grades. Several people told me that it wouldn't hurt to run detergent oil in this tractor. A dealer that sells parts and is a sponsor for this forum told me to only run 30 weight non-detergent oil. I went to WalMart to buy 30 weight non- detergent oil and it says on the bottle "not to run this non-detergent oil in any engines newer than 1930" because it has no additives added and it will damage the engine" Who do I believe?