Allis Chalmers 821 Power fluid

"Vintage" oil is a marketing ploy, and not always less expensive, at least to the buyer, as you noted.  Do a bit of research and I believe you will find the "modern" oils/fluids are backwards compatible to the "older/vintage" ones.  Why would a manufacturer want to add more products to stock and deal with, other than in the cases where the product was going into new hardware that is not similar to existing.  John Deere doesn't sell 303 Special Purpose Oil, J14A Hy Gard, J20A Hy Gard, the current J20C covers all of them.  Same applies to the AGCO fluids I believe.  Look at the manufacturer specs an oil/fluid covers and go with the newest.  And if you cannot find the specs for a product on the container, or a Product Data Sheet for it, I suggest avoiding use of said product.

Jim.ME wrote: "Vintage" oil is a marketing ploy, and not always less expensive, at least to the buyer, as you noted.  Do a bit of research and I believe you will find the "modern" oils/fluids are backwards compatible to the "older/vintage" ones.  Why would a manufacturer want to add more products to stock and deal with, other than in the cases where the product was going into new hardware that is not similar to existing.  John Deere doesn't sell 303 Special Purpose Oil, J14A Hy Gard, J20A Hy Gard, the current J20C covers all of them.  Same applies to the AGCO fluids I believe.  Look at the manufacturer specs an oil/fluid covers and go with the newest.  And if you cannot find the specs for a product on the container, or a Product Data Sheet for it, I suggest avoiding use of said product.