I know I'll probably get bashed for saying this, but years ago while at Knob Creek machine gun shoot, I met Arthur Ceiner, the mastermind behind the many 22 conversion kits. I asked him what lube he recommended and he pulled me close to him, and whispered in my ear..."any good quality synthetic motor oil", he said if its good enough for a formula 1 car at 15K rpms, it'll be fine for a machinegun or most any other gun. That was nearly 10 years ago and I have been using Mobil 1 synthetic every since and have never looked back. I am still using the same quart container I bought nearly 10 years ago as well, I just keep keep refilling a smaller container. I realize that they market all kinds of nifty new cool stuff, but its hard to argue the fact that a car engine sees more heat, more metal on metal contact, and more use than most any gun will......So why wouldn't a good quality motor oil work??