05 Oct 11 07:52, TOM WALKER wrote to ROY WITT:   
      
      
    RW>> TW> I see where Moble1 now has an Extended Range version and theyare   
    RW>> TW> advertizing up to 15,000 miles(Very Light duty service I am   
    RW>> TW> sure) between changes, OR a maximum of ONE year between oil   
    RW>> TW> changes.   
      
    RW>> I haven't seen that one. I doubt that I'd use it anyway.   
      
    TW> Wel the oil itslef soes not wear out and since the full synethic does   
    TW> not break down like standard oil in some cases they use very long   
    TW> times, Years, between actual oil chnages.   
      
   Agreed.   
      
    TW> The case I am thinking of in a submarien Diesel engine. OF course   
    TW> they had the oil analized periodisly, Uses a very fine bypass filter   
    TW> and ran the oil through a Purifier(Centrifuge) to really clean out   
    TW> any contaminaton.   
      
   Could also be in a semi-tractor diesel engine.   
      
    TW> And depending on the results of tha analysis would add additiaves to   
    TW> bring them back up to what level was desired.   
      
   I learned the other day that semi-diesels use gallons, rather than quarts   
   of oil. And that oil will go pretty far because of the same tecniques you   
   describe above.   
      
    TW> After saying al of that it is far more practical to just change it   
    TW> when used in smaller engines.   
      
   I think so.   
      
   Back in the early 60s, I used to buy used bulk oil, filtered and cleaned   
   at 15 cents per quart. They would put additives in it to bring it up to   
   par. I had an old Ford that would burn 4 quarts of oil every 25 miles and   
   my job was 28 miles from home. Had to stop half way and put in a couple of   
   quarts, every day. I fixed that Ford by buying a used but junk Ford and   
   swapped engines.   
      
                   R\%/itt   
      
      
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