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

They stock those at Auto Zone, and I was not impressed with their
construction at all when I checked them out. The name Bosch just
doesn't mean what it used to -- apparently, they're licensing the name
out to some companies that will put it on substandard products. Looking
at the consensus opinion on the web, it looked to me like Mobil 1
filters were widely admired, and when I inspected them in person, found
that they are definitely a well-made filter. That's what I've been
using for the past couple of years. They're made by Champion, but to a
higher spec than Champion's own brand.

The spring mechanism you can see inside some filters is the bypass, not
the check valve. If the filter element becomes clogged and the internal
pressure of the filter becomes too great, that spring allows the oil to
bypass the element so oil flow is maintained. The check valve is the
rubber flap you see in the smaller holes that surround the big center
hole. It keeps the oil in the filter from draining out when the
engine's not running, so there's some in the lines immediately on start-up.

Brian Running wrote:
Well that's interesting. The Bosch filters i got have a rubber
ring running around under the ring of holes, just no bypass apparently.

My Mann filters W719/5 have the bypass apparently, but the surrounding
holes reveal no rubber, but metal immediately underneath... presumably
the check valve is hidden.

So from what I can tell the Bosch filters would be OK for my cars
that have been on synthetic for years, but I'll want the bypass
for the 96 that still carries it's first synthetic.

I'm supposed the receive a return # for the Bosch filters anytime
and have already ordered the specific Mann filter i've been using
from cpffilters.com, which has hundreds of Mann filters, at least,
I just looked at the W's. If I keep all of these filters I'll have
24, or four years worth at my 6 month interval.

Gee, all I wanted was 2 years worth.

IR

I have used OEM, Fram, AC, Autolite, Bosch and maybe a few moreover the past
30 years and never had a oil filter cause issues on my VW's... and other
cars too. The secret, change the oil regularly like every 5000miles or once
per year.


"IR" <non (AT) sequiteur (DOT) org> wrote