I have an old edger that I will probably try to sell that I just pulled out of the shed. I wanted to change the oil before starting it because it hadn't been run in ten (or more) years. Have had a sealed bottle of Pennzoil HD 10W40 API SE/SF on the shelf so long I don't even know where it came from. Had no plans to use it for anything and considered just recycling it but thought it would be just right for this old Briggs and Stratton 3HP so I gave the bottle a good shake and put it in. Ran it for a while and seems to be good to go, not that it takes much to make that old engine happy