I've a Snapper walk behind. I've had it for nine years now. This year it started on the third pull after winter storage. The tank was dry. I've not changed the plug during this time but change oil and sharpen each year whether it needs it or not, ha!
I paid about $500 for it. The blade is a direct connect to the shaft. It has a recycle blade. I overheated it once and since then it does use some oil; maybe a half quart during a season.
Works fine for a long time.
Thunder