Girlfriend's family's generator, 5000W Briggs with a 9HP B&S Vanguard engine.
Out: Mix of whatever 5W/10W30 I had laying around before giving it to them this time last year (it was gifted to me from an old coworker).
In: 1 quart QS Defy/HM 5W30.
Some sources say it takes 33.8 ounces and some say it takes 40, this one was right up to the full mark with one quart. It will only run reliably on partial choke, will be draining/washing the gas tank and changing the shutoff valve, filter and lines soon. If that fails then an Amazon carb is going on.