As I have been working on more and more German cars, which are known for their long lasting time between oil changes and over 200K plus miles and such, talking to a couple of techs and spending more time on the BMW and Mercedes forums it seems that they contribute a lot of that to their oil filters. My though it the 540i I am changing the engine in right now has a remote oil filter, and is a cartridge style.
they look like this
![Image](http://www.knfilters.com/images/l/HP-7006.jpg)
In a can like this:
![Image](http://www.pelicanparts.com/bmw/techarticles/E36-Oil-Change/pic1.jpg)
After you change the oil you see things like this:
![Image](http://img238.echo.cx/img238/6296/filter4qm.jpg)
My wife's car looked nowhere near that dirty and after 1 year and about 26K miles which is the factory recommendation on oil changes. It has been about 6 months since I changed the oil in her car and probably 10+K miles and is still nice and clear. Now I would not go that far without an oil change but I think this filter system could be more beneficial than what we currently use.
I think my plan will be to get a remote oil filter adapter and a filter cartridge from a 540 and start from there. Any thoughts?