You guys do have to remember a uoa doesn't just tell you wear numbers. tbn, viscosity shear and fuel dilution are just as important
I'd do a uoa after each 5k oil change. starting at the second or third one.
Maybe so he can make sure the oil he's using is good to go at 5000 miles.
GumbyJarvis if you want to watch your wear metals decrease, by all means get the tests. I agree with the post that suggested waiting until 20k...except if you have doubts whether your oil will make it 5k miles or not, then by all means get it tested...after all that's what UOAs are for - to check the oil and, by extension, the wear metals for early detection of issues.