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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