Double guns are not turbine engines. Just use something. Don’t run it dry. Clean off the old and apply clean new oil or grease often . I like Red and Tacky grease. A tube or can will last a lifetime.
No disrespect intended, Mark. But, corn headers on John Deere combines are not turbines either. But the manual calls for three different lubricants for them. Corn head grease for the gearboxes, polyurea type grease for the bearings and SAE 80W-90 in the chain housing. And, there are fellows here who paid more for their shotguns than a corn header costs. Point is, it's not that hard, or expensive, to use the best lubricant for the job, IMO.
