When these intense Lube and Filter discussions break out I'm prone to think that if engine operators put near as much focus on other specific maintenance items such as proper fuel preparation (meaning filtering and atomizing) they would better serve their machines. It is perceived that clean lube and lots of it is the path to eternity. You can talk about removing contaminants from the lube but is it not better to prevent it's entry in the first place with good fuel preparation (therefore good combustion) and adequate clean air or good running conditions.

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Retired Marine Engineer
2005 E320 CDI
1987 300 Turbo Diesel @ 300,000 kM going
1974 240 D 300,K Miles when given away gone
1970 200 D gone
1969 190 D gone

after reading all of this "cotton gin" waste contraversy, Wouldnt it just be easier and cheaper to install a spin on filter in place of the cartridge?

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

So, you are using an unpressurized oil source...

I will let the picture speak for itself. This picture was taken right after I started up my car with a cold engine and at idle speed of around 750 rpm.

There is also another hole under those vacuum lines where I tested the pressure of the oil outside of the by-pass portion of the filter. Both inner and outer readings were essentialy the same.
I was surprised by this and removed the filter cap and blew compressed air through the little hole at the top of the stem to see if the check valve was blocked and air came out of the bottom of the stem. I retested it and I got the same results.
Evidently the spring/check valve has enough resistance that the oil pressure is maintained or I guess it is possible there is some bolckage down below where the stem goes; but I did nothing to block it.
In any event I hooke up my by-pass filter oil inlet hose to the center of the cap (this oil has already been filtered by the by-pass section of the stock oil filter) and I am getting that hot hose going into and out of the external by-pass filter.
When the oil gets hot the pressure at idle drops as is normal.

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84 300D, 82 Volvo 244Gl Diesel