We bought a 2010 MKX last month and I was wondering how many of you change your oil and do you use synthetic or regular oil (aka dino oil)?
We had a 2003 Excursion 7.3L that we traded in and I changed the oil in it a home. Just wondering if the synthetic is worth the cost, since Ford recomends it. I know I can save money by changing it myself and is definitly easier than the diesel engine. What proof will be needed for the warranty as to oil changes at home instead of the dealer?