The most important thing you can do for your car: Around every 4th/5th oil change (about 15,000 miles), there are some extra filters, lubes, and inspections to be done; in order to properly care for the Subaru. This also happens to a greater extent around every 9th/10th oil change (about 30,000 miles,). So, at 150,000 miles, an “Every 30K Service” is a factory and dealer recommended service. The Dealer Service is a less intense service than the Factory Service. Please take the time to educate yourself to the differences on the Education page of this site.