"Simply put, the shelf life of conventional motor or "lube" oil is up to five years. It’s not something that goes bad in a couple of months. It’s impossible to predict exactly how long motor oil shelf life is because petroleum stability (how well it resists change in its properties) is situation-dependent. It depends how much exposure it receives to things that can speed up its degradation.

Petroleum products “go bad” because of chemical reactions that get started upon exposure to things like air and oxygen, heat, light and water. As such, how you store the oil influences its shelf life. But even with these considerations, we’re talking about the difference between a quart of oil lasting for two years in your garage vs. five years. Just keep it away from long-term exposure to extreme heat, and keep it sealed up so it isn’t constantly exposed to air or have the chance to develop condensation. Your oil will last longer on the shelf than you think it will."

www.bellperformance.com/blog/motor-oil-shelf-life

And are you suggesting that your engine's demands on it's oil are less now at 197k than they were before? Or is it that you don't care anymore?