Yes ¢75 cents per hour. My bad. Still what's that in the grand scheme of things? We are using more than that in diesel fuel per hour. Years ago I sent for oil specs and test results on various oils from different manufacturers independent lab analysis. I spent time studying them. Spectro IMO and Red Line are both high quality true synthetic products that exceeded other products. I've been using it in my bikes since the seventies. In 1997 I had my Harley in for service. The lead mechanic came out of the shop and said to me " Your bike is the quietest running and best shifting Harley I ever rode." The dealership went on to stock Spectro on their shelves along with Red Line. Customers ask for it. I also was in a BMW dealership upstate N.Y. The salesman was a Amsoil dealer.
He confided in me that he ran Spectro oils in his own bike. BMW oils at that time were made by Spectro in Brookfield Connecticut. I changed my Kubota BX's engine oil and filter at 21 hours. Used 15W40 Shell Rotella full synthetic.. I only use full synthetic oils. I also use Howells diesel treatment in the diesel fuel..I add Marvel Mystery oil to my gas powered equipment and run non ethanol gas. My 32 year old Gravely 12g rider runs like a top..When we removed the head off it to replace a broken exhaust stud the valves,head and piston top, cylinder looked like new.. Synthetic oil, regular changes, gas additive, and non ethanol gas I believe is why. Maintenance, high quality lubricants and care equals product longevity IMHO.