If you must have a lawn (e.g. HOA, personal preference), I strongly recommend doing away with this nonsense and go electric. Better yet, stay ahead of battery obsolescence and get a plug-in model, provided your yard is small enough. No more gas, oil changes, clogged filters, re-gapping spark plugs, and no more dislocating your shoulder trying to start the damn thing. Just keep the blade clean and sharp and it’ll run for a decade at least.