I was part of the 3000 mile club. I do 6 month OCI's on my Jeep to satisfy a warranty. I've done 1 year OCI's on a van, but have been using it more lately so I might go to 6 month OCI's on that as well. My Aerostar sees severe service so I was changing that oil every 3000 miles, but I might bump that up to 4000 mile OCIs.
I follow my OLMs. Comes out to about 7,500 miles on both. The CRV's is much more rudimentary than the Ody, but when I changed the timing belt at 102,000 miles, the engine looked brand new under the valve cover.
Suburban driving with typical trips of 3-8 miles. Synthetic OCI = -8,000 miles. Dino pennzoil yellow at 4,000 miles. My OCI supported by used oil analysis and I could easly add 2,000 to each or 10K & 5 K, except I do it myself and enjoy doing it.
Six months or 7500 miles...usually im under 7500 miles when its time to change...this is in the Tacoma, the Jetta about every four months or 5000 miles.
3000 miles on oil and filter after initial 500. 25,000 miles on transmission fluid and filter after initial 5000. 25,000 or rear axle after initial 5000.