Oxygen reacts with the oil. That is why you need to change it due to the time it has been in the engine.

I have an 09 F150 that only gets driven a couple thousand miles a year. I change the oil once a year. It costs less than $50 to change so it’s cheap insurance.

Once per year…

Once a year it should be done regardless of distance travelled.

Thanks for the advice. I’ve been changing the oil once a year, but I was wondering if it was a waste. Especially since it takes 12 quarts. I’ll continue changing it once a year

Depends where you live. If it’s hot and cold alot. I’d do yearly. If you don’t have that you could get away with more but I’d still try and get it done yearly.

With my last (08 6.4) and current (13 6.7) diesels I do them 2x per year. Once when towing season is about to start. We have a 38’ fifth wheel. And once when deer season is about to start. Basically when I’m swapping my road tires for my all terrains. I’ve never been comfortable going longer than that. I don’t put very many miles on per year but I’ve just always done it that way.

Make sure when you drive it you drive it long enough to bring it up to operating temperature. Short trips are killers on an engine. If it’s stored inside vs. outside the engine isn’t subject to the changes in temperature that would cause some condensation, also depends on the climate where you live. Once a year oil changes are cheap insurance. That diesel would be expensive to fix if something went wrong internally.

Do it once a year

Oil changes are recommended after a year, so that’s what I’d do in your place

I typically change most of my cars when they need to based on mileage which is anywhere between 6 months to a year. I do have several cars I rarely drive like <200 mi a year, some have gone 5-7 years without a change and I’ve never had any issues. When I do drive them I try and spend 20 min or more on the interstate to heat the oil and remove any moisture. Just change it at intervals you’re comfortable with, I personally have never heard of an engine failure from aged oil but I have seen oil break down from extreme mileage or overheating. I have farmers in my extended family who have rarely driven tractors and grain trucks that are simply outdated but are used once in a blue moon, some of them haven’t seen an oil change since the 90s and still start and run fine. Any anecdotal evidence is useless, if you want to know for sure what shape your oil is in it would need to be analyzed in a lab. I wonder if there is a study on oil breakdown over time, would be an interesting read.

Still have to do it at least once a year.