I have saws old enough they call for 16:1, run every thing on Synthetic at 50:1, even the milling saws. I think I just found my next saw. Went over my shooting buddy’s apartment to help take down some dead Ash trees. Was showing his landlord pics of my saws. He said he had one old saw under his work bench, a Sachs-Dolmar KMS4. If you don’t know what it is, look it up. It’s a gem. Acres calls it a 3 cylinder. Wonder what oil it takes?