OP, I’ll recycle your 10+ gallons of 2000 miles engine oil, into my engine...I prefer Shell Rotella T. 50 years ago Cat recommended 100 hour oil changes in their heavy equipment. With oil sampling I went to 250 (could of gone longer) but easier to keep up with when to change.
Just bought a new Cat SkidSteer...recommended 500 hours oil changes and Cat knows it’s going to be hard hours... 90+% power most of the time. 500 hours at an average of 55 mph is 27,500 miles. Most of the time my DP is using 40% power.
The oil sample when I changed for the first time at 15,000 mile showed I could have gone longer so next time at 15K miles I’ll take a sample and if it shows still good, I’ll change the 12 gallons at 20K.
I go 500 hours on the diesel generator mainly because it’s easy to remember.
On a gas rig I’d probably go 5000 miles as it’s all of 6 quarts to change.