I have a couple of Pre-Magnetic Dampened powder scales that require the use of 10 Weight Motor Oil according to the instructions. I went to the place I usually buy all my Engine oils for the cars, truck, tractors and lawn mowers, and haven't come across any "10 Weight" motor oil. All of it seems to be multi-grade 5w-20, 5w-30, 10w-50 and so on. So, does anybody have any suggestions for a 10 Weight motor oil substitution? I have lots of hydraulic oil, jack oil, automatic transmission fluid, power steering fluid, brake fluid and on around the shop, but don't know if any of this would be proper for a reloading scale paddle type dampening reservoir. Anybody tried something else that seems to work well in one of these? Thanks for any responses.