Quote:
Originally Posted by 97 SL320
Ugh, not another used motor oil thread.
One of the reasons motor oil is changed is because of it going acidic ( it comes back as a low TBN Total Base Number in a oil analysis. ) . Some put all sorts of filters to protect the injection pump but will burn used up motor oil thinking they are doing good.
Also, motor oil isn't designed to be burnt, it has all sorts of additives that turn to ash / carbon. Do you really want to load the combustion chambers with carbon / abrasive ash? 2 stroke oils make a big deal about being ashless, I'd think they are on to something.
Viscosity improvers in motor oils are polymers, ( plastic ) Do you really want to have such chemicals running through your combustion chambers?
Yes a diesel ( or even a gas motor at reduced percentages ) can run on old motor oil, but in the long term what are you risking / saving in the long term?
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Dont knock what you havent tried. Clean the oil well and run it. I have read posts where guys have 50-100k on use motor oil at up to 80% blend. I run it in my powerstroke and i runs great with better power and mileage and no more smoke than diesel. I have about $4000 in fuel value in oil around here and a $5000 Mercedes 300D... Ill take my chances