Every 2K is overkill except under unusually adverse conditions: very very dusty, many many short trips in cold weather with lots of idling, racing, or operations where the oil is severely overheated. Even the people who sell oil and do oil changes only recommend every 3K. The Click and Clack Brothers, who are actually much better mechanics than they are comedians, recommend every 5K. Every 4K to 5K with mineral oil is fine for average, everyday service.