Does anyone here really do the 20,000 mile oil change here? Pros? Cons?

No, and not going to.

No, I go 10,000 though. That's what the manual says, so that's what I do.

I just change the filter and top it off...

Yes...AMSOIL......25K or 1 yr.....been doing if for 16 or so years.......and I don't just do it bc it's 1 yr in-between changes....I mainly do it bc IMO AMSOIL is just a better product.....saves a few bucks and saves time.

I do 10K on full synthetic. never had my oil analyzed so I dont know if thats bad

I do my Lexus every 7k and my Merc every 10k. Just like I’m supposed to. And I have zero problems with both.

There’s a reason cars come with manuals and maintenance schedules.

Follow them for YOUR specific vehicle.

I do it when the 2fiddy tells me to do it. It seems to be between anywhere between 9,000 and 12,000. I think I remember reading that it calculates load, idle time, etc in when to tell you. If I had a gas truck, I could see doing longer especially if I didn’t tow much.

I think the wife’s Toyota is just stupid and flips the light on at a set mileage or time from the last oil change. We have close to the same mileage and I swear hers had been changed more than mine.

I've gotten in the habit of using synthetic and changing the oil every 10K in my vehicles. A bonus tip: I change it when the odometer changes it's 10,000 mark. That way I don't have to keep up with when each vehicle needs it.

I've done oil analysis on big diesels and pushed good synthetic oil products out to 3000hrs. I wouldn't do it without sample analysis and I don't do it on my personal vehicles. But modern oil is some pretty good shite.