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Given really good filtration, and good oil, you can definitely keep it longer. It's not always worth it though. It depends on how much longer you'd be able to run the oil before it is actually worn out. Diesels tend to dump more crap in the oil, but produce less acids, thus this type of system benefits them more. In addition, it takes a while to wear out 30+ quarts of oil.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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