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The old Mercedes Diesels had oil change intervals of 10.000km, but the manual said "under severe operating conditions, intervals have to be reduced". And as Autobahn speed means pedal to the floor on these rather asthmatic engines, I considered my driving "severe driving conditions" and thus...

I just found this thread and like to chime in. Disclaimer: Note that my vegetable oil experiences date back from 2003 to 2008. I did not follow the VO forums since I sold my last diesel in 2008. In the good old days before Mutti killed biodiesel and vegetable oil, there were some (albeit rare)...