Shpo Info: Get Your Oil Changed.
The mileage matters much more that the time frame. 3,000 for conventional, 5,000 for synthetic. Prior to yesterday, I just knew it was the right thing to do for the engine. There are timing chains\belts implications.
Guy came pizzed because he's getting this timing chain/belt replaced for the second time in three years, trying to say the second replacement should be on us. Looking at the vehicle records, they went 9,000 miles without an oil change and filter. This time, over 10,000. Older oil gums things up. The even if the oil could be good for 9-10,000 miles, the filter can't handle it.
The 3 or 5k miles or 6 months is a bit of a Big Auto messaging. Putting less than 3 or 5 k in miles, you can still get away with having the oil changed once a year.*
* I'm not a mechanic, I'm relaying what I heard, how I heard it. Not a doctor either. Or a lumberjack, or plumber, etc.