Hi,
I just recieved a dozen Bosch 72211 Oil Filters for our A2 and A3's from AutoPartsWarehouse.
They don't apparently have check valves. When you look into the Mann W719/5's I have, you see a spring mechanism. The Bosch filters you can see clean and clear to the end of the filter. They are black filters with no real printing, they have a blend-in black sticker and are Made in USA.
It seems pretty clear they don't have check valves. They say OE fit. Sure, great. I guess I'll be trying to return them.
I sure don't want to use these things during the winter, and I presume that the check valves were invented for a reason.
What say all?
Irv