A new oil filter from Omix replaced the old one from (probably) the late ’70s. Yes, I’m holding the new element upside-down in the photo. Sue me. Although the filter element fit the canister, the supplied gasket for the canister top did not. The old gasket broke apart when I removed the lid, so the filter canister leaks. I’ll order a replacement online. I filled the crankcase with straight 30W oil.