There are only two reasons to change your own oil in the woods: money and the satisfaction of doing something yourself. That said, my van is a year old and has over 40,000 miles on it. Dealerships are slow and charge over $100 for a full-synthetic change. The Transits ship with a synthetic blend oil and are rated for 10,000 miles between changes. I changed over to a full-synthetic on my second change and haven’t looked back. Changing the oil as I do, with full-synthetic oil and a high-mileage oil filter can be done for half the price..... Read the rest