The most important things you can do for your vehicle is changing vehicle fluids! Oil and filter changes is a given, we do a lot of them which include many benefits such as other fluid checks and top offs. Lets take rear differential fluid for example, many of todays diffs have clutch plates installed that cause the fluid to heat up quicker and in turn degrade more often that require earlier fluid changes. Some manufactures have intervals set early as 18k miles if towing or driving in hotter climates such as our summer heat. AWD vehicles are popular and have small units buried near hot exhaust systems and hold less than a quart of oil which degrade even quicker. ,https://allphaseautorepair.napavision.com/topic/differential-service/ Units are expensive to replace, more frequent fluid changes will prevent that! Keep your vehicle expenses down contact Terri 410-687-5030.