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I am new to this site. I had been running between 50 and 90% filtered to less than 10 microns used oil picked up from auto shops and ran through my 3 stage filtration system. Have ran a truck a 7.3 mechanical injected ford turbo diesel with nearly 200,000 miles on this for approx. 20,000 miles with minimal trouble. Recently have been putting about 10% of this filtered oil in my girlfriends 97 tdi jetta. Have seen no change in how it runs. Has anyone experimented with used oil in TDI's? I am thinking about uping the % as the weather gets warmer.
 

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You could but as you have hinted at, the wear inside used motor oil isn't good for the long term life of the engine. I don't know how fine it can be filtered. On your 97 it's certainly more tolerant than a 2004+ PD engine or new common rail engine, not just in the fuel injection but the emissions filters.

You mentioned "minimal trouble" :D Would that be worth it with the girlfriend if her car has a problem :D
 
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