Your drain intervals should be based on something real. I think the 3000 mile oil change is a waste of time and money.
I drive mostly dirt mountain roads, often in 4x4 mode, steep mountains, etc. I do used oil analysis and base my maintenance of filters and oil changes on that. I have determined that I can run 4000 miles with less than 4 ppm of iron if I don't allow cleaning of my air filter (just throw out every 4 oil changes). I have also determined through analysis that over time the bearings corrode if left in old oil, so my rule is 4000 miles or 6 months, and park for more than a month with used oil, always fresh.
I do this for my 11 vehicles.
I've also analyzed oils for hundreds of other vehicles and equipment and set the parameters for each company according to their use. In a company with 60 pickups that run 30,000 miles a year each, extending oil drains saves a lot of money and time.