is a newer version of the Wal-Mart oil filters showing up in the
new filter looks just like the older one on the outside, but when I
cut one of these
I found that the pressure relief valve has been changed. In my
below report of the ST7317 oil filter I stated that it uses a
rubber to metal seal for the pressure relief valve,
old version is a product of the USA.
pressure relief valve in the newer version has been changed and
not for the good. The new filter uses a hard plastic to metal
valve much like the ones in the Fram's. They are two quick and
obvious ways to spot this new filter.
The new filter is stamped on its top 'Product Of Mexico'
If you look through the large mounting hole in the base you will
see a blue disk
inside the filter instead of the coil spring in the older
blue disk is part of the new pressure relief valve.
than the changes in the pressure relief valve the two filter are
pretty much the same.
don't feel that the made in Mexico version is as good as the
older USA made one, but I think it still may be better than the
Inside The Wal-Mart Super Tech ST-7317 Oil Filter
I've heard many different things about the Super
Tech oil filters from Wal-Mart. I've heard both good and bad.
What I've found is that they are a few of the Super Tech filter
in the Wal-Mart line up that looks to be filters that may be
manufactured by another company to possibly help fill in in some
product gaps, this is called Outsourced.
I've not cut apart any other of the Wal-Mart line of filters
other than the ST-7317. The main reason for this choice of
filters is because this is the correct filter for many of the
later VT shadow's, including the 97-2005 1100 Spirit.
The USA made ST-7317 is manufactured by "Champion"
which is a main stream filter manufacture.
I hope you find the below information helpful in your next
purchase of an oil filter.
The whole filter, NEW UN-Cut!
Now with the end cut off, the USA 7317 has a heavy
steel base that
seems to be VERY well attached.
Here is the inside filtering media with metal end caps. I've read
reports that mentioned these filters having uneven pleats in the
filtering media. This shown in this picture I don't see this as a
problem. These filters also use the synthetic enhanced filtering media.
This picture shows how well the metal end-cap is attached
to the filtering media. I could not pry the caps off without tearing the
media just above the bonding glue. (Looked like some kind of epoxy, it
is some pretty tuff stuff.)
Now the filter is torn down a little more. In this picture is the spring
beneath the pressure relief valve. You can see this spring in a new
filter by looking through the large center hole in the base of the
filter. The pressure relief valve is made of metal with a round rubber
sealing disk/pad at the top.
This picture is the top end of the filter's end cap. The black center
is the black rubber pad that the pressure relief valve uses for a seal to the
media's end cap.
If something happens to the filter media that will not allow oil to pass
through it (cloggs up), then the pressure will start to build inside
the filter housing. This will apply pressure to the pressure relief
valve pushing it away from the mediaís metal end cap. This
unfiltered oil to flow by the relief valve and back into the engine. The
thinking here is that dirty oil is far better than no oil!.
I see no reason for this system not to work! The valve is
where it's supposed to be!
Here are all the parts of the filter and the order that they go. The
pressure relief valve is still mounted inside the mediaís end cap
although you can't see it in the picture. It's not at all like
the hard plastic
valve used in the Fram filters.
The Wally World Filter Part Two
I wasn't planning on going this far with the oil filter but after I got
into it I decided to go on with the project. Just keep in mind that these pictures were taken
after the filter was pretty much destroyed but I felt that I could use the parts for illustration. So, I
used some tape to help hold some things together for the next two
This picture is of the filter base and the anti-backflow valve
which doubles as a seal for the neck of the filter's in-cap. The
alignment is correct. When the seal is in place its outer lip completely
surrounds the smaller oil inlet holes.
This picture shows the metal suspension spring and its position on the
filter's in-cap. This is the end with the pressure relief valve. The arms
of the leaf spring rest in the very top of the filter's outer shell.
Wally World Oil Filter 'The Final Chapter'.
This picture is of the entire Pressure Relief Valve 'Assembly" broken down'.
The end cap is the end that would be in the top end of the filter.
Some filter companies (Fram) uses a hard plastic pressure relief valve
as a seal to
the end cap and others use metal. These types of seals can let unfiltered
oil flow by them. The rubber type seal used in the 7317 filter provides
better sealing. This
picture shows the flexing of the rubber seal in the Super Techís
I see nothing about the pressure relief valve in the (USA) 7317 filter
that could keep it from working! The rubber disk should seal well to the
metal end cap.
This picture is of the internal filterís end-cap and a cut in half
seal. This is the end of the filter that mates to the base plate. The
seal doubles as a seal and an anti-backflow valve. The other half of
the seal will be shown later as part of the base plate. I said that this
seal doubles as a seal and a anti-backflow valve; however, its a seal
between the unfiltered incoming oil and the filtered outgoing
Here is the picture of the base plate with a cut away view of the seal.
If you look close you can see the outside of the seal's lip covering the
filterís oil inlet holes. That outer lip is the sealís anti-backflow
section. The incoming oil lifts/pushes the lip of the anti-backflow
valve off the metal base plate to inner the filter. When oil isn't
flowing into the filter the lip of the seal keeps the oil in the filter
from flowing back out of the filter.
The anti-backflow valve is rubber and seals against metal, both on the
mediaís end cap and the filterís base plate. The center part of the seal is what seals the incoming oil from
the outgoing oil. All the seal surfaces are rubber to metal.
Other companies use rubber to paperboard or metal to
metal. Most reports Iíve read seem to prefer the rubber to metal and
none of them like the paper board end-caps that are used in some
There is a web site that shows a Super Tech filter that
was destroyed in the process of removing it. They claimed it was due to
the filter having a cheap light weight metal outer housing. The outer
can is a little lightweight but itís steel or at lest an alloy with
steel in it. A magnet sticks very well to it. Destroying
a filter taking it off from an engine is not uncommon and
is usually caused by not oiling the filters gasket and by over tightening
it as most of us know.
Yes, it's probably true that Wal-Mart could change the supplier of their
oil filters at any time, so you might want to take it out of the box and
look at the bottom of it to see if its different than what you've been
using or its different than the below picture then it's made by
someone else or somewhere else. Also look at the top of the filter for
"Product Of USA"
I don't know if I could call the "Product Of USA" ST-7317
the best filter made,
but itís looks to be a pretty good one and for $2.07 it's on my best
buy for a filter list.