I have been working on some older Homelite saws I acquired. Super EZ and Super 2 are running XL 123 is work in progress. I have Stihls, 200T, MS362, MS460, Husqvarna 272 3ea. I have been running 50/1 Stihl synthetic in those saws. Was wondering if I change my mix to 40/1 Stihl synthetic would it be OK in all these saws including the older Homelites?