So you're changing the oil on average at 1000 miles and 6 months on the Jeep and 1600 miles and 6 and on the Camry?My 2015 Jeep has only 19,000 miles. And my 2018 Toyota Camry just turned 16,000 miles. Both were purchased new, and neither one has ever been driven on a wet street.
The only time either one gets wet is when they're washed. Which is about once a year max. But they are started and driven at least once a week until the oil gets over 200F.
I change oil and filter every 6 months. Which is probably too much, but it's easy and cheap to do. They're both garage kept and the garage is both cooled and heated. So nothing is "aging out", except for perhaps the driver.
I wouldn't worry about 3 oil changes in 11 years, with that low of mileage. But I would for sure change both it and the filter right away. And I've never had an issue with gas going bad in any of my vehicles or gas powered equipment. Fuel injected vehicles handle bad fuel a lot better than carburetors do.
I mean, i don't want to offend you, but that is kind of ridiculous, you could EASY, go over 2 years between changes.
Changing oil that often doesn't benefit the engines at all, and i mean 0, you may be even doing more harm than good, as each time you change the oil , the anti wear additives that bond to the metal in the engine are mostly washed away and then have to build back up again, this has been proven by measuring wear metals right after an oil change, and contrary to what logic would say, the wear actually tapers off as the oil gets some miles and time in the engine, obviously after enough time and miles the wear metals start to go back up again as the condition of the oil begins to degrade.
Just my 2c