On 12/19/2011 2:48 PM, Nate Nagel wrote:
On 12/19/2011 05:11 PM, Larry W wrote:
Regarding stop and go, slow speed use in the context of severe service:
Few usage patterns would be more likely to fall in this category than
inner city delivery service. Fleet operators, unlike quickie oil change
establishments, dealer service departments, independant shops, DIY auto
supply stores. etc. have no incentive other than to operate and maintain
their fleets in the most cost effective manner. They have demonstrated
that
it is not necessary to change oil at 3000 mile intervals to get
reasonable
longevity from modern engines using modern fuels and oils. By reasonable
I mean engine life of at least 150,000 to 200,000 miles.


I'd be awful disappointed if my engine wore out at only 150-200K miles.

nate


well i think we'd have to define "wore out". are we talking a quart in
3000 oil consumption? How about a rod knocking? Maybe just a flat cam,
and all else is fine. How about a timing chain failure? Any ONE of
these items do not qualify for a "worn out" engine in my opinion. Now
if we're talking major oil consumption (more than 3 quarts in between
3000 mile oil changes) , Oil pressure next to nil due to worn cam and
main bearings, and lifters clattering , all this using straight 50
weight oil, then i think we'd probably be talking worn out. I had a cam
go flat and ruined roller lifters in a 6.9 diesel that i had religiously
changed the oil in every 3000 miles. That's FORTY FIVE oil changes in
the 135,000 miles before failure. What caused it? Multi-vis oil was
the determination from Ford. They put in a new engine for free. I
still have the service dept yellow copies.

--
Steve Barker
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