Originally Posted by GeePStrings
I have to admit I've never filled the filter with oil when changing the oil. Just read about that recently. Although I dont get it - I assumed it would fill once I started the motor. What is the mechanical advantage to pre filling?
You're correct the filter will fill itself. However pre-filling helps to get the oil flowing faster to the engine internals, reducing start-up wear after an oil change. People like myself that are a little OCD prefer to fill the filters, IMO it helps. Some filters hold close to a qt of oil, and pre-filling helps quite a bit, if the filter is situated in a position that allows for pre-filling it.
A bad Anti Drain Back Valve can cause dry starts each time the engine is shut down and left for a few hours. A bad ADBV will allow the oil to drain back into the engine, and you'll sometimes hear start up noise, because the filter has very little oil in it.
The 2012 is a totally different animal, has the filter on the top of the engine and no ADBV.