EricAl

The MAHLE oil filters I had been using apparently have a drain back check valve in the filter body. At least I think that is what I see, but the MANN filters don't seem to have this feature.

I had though BOTH were anti drain back filters. Are they? Or do I not understand what I am seeing.

repeater

The filter on the AAN sits in such a way that oil cannot drain back out of it. On other Audi applications, like my A6, it is necessary to have an anti-drain back valve to prevent oil from escaping back into the pan, due to the angle of the filter (approx 45 degree angle). Sure, having one is nice I guess for whatever reason we want to believe, but fact is it's pointless on our cars.

Bill the Cat

2nd.. Put yur $$$ into the best damn filter you can get. I use Mann. (Mahle is a great 2nd)

tpierce

It is for when the engine is shut down, it could end up sucking the oil filter dry in the last few seconds, or the filter could leech back into the pan, but since our filter are vertical, it isn't too important.

TabulaRasa

When you do an oil change, do you fill up the filter with fresh oil before you spin it on? I do.

repeater

If you don't, the engine is oil starved for 3-4 seconds while the filter fills up.

repeater

Baldwin or Purolator Pure One

Bill the Cat

And if the only filter available is orange - park your car.

repeater

They've gone to a metal cap on the filter element and are running nitrile gaskets and drain backs in them. They are much, much higher quality that the cheap-o Frams.