The article linked above is a good read and helps reinforce my belief
about going with the manufacturer's recommendations on oil change
intervals, or even longer.
The owner's manual for my 2003 Civic says to change the oil every 10k
miles or every year, whichever comes first, using 5W20 non-synthetic,
and assuming no extreme conditions, per what is explained to be
"extreme" in the owner's manual.
The wikipedia entry for "motor oil" talks about how oil standards have
changed, driving the increasing interval over the decades.
Severe conditions are defined as follows:
- Driving less than 5 miles per trip or less than 10 miles per trip in
- Driving in extreme hot (over 90F) conditions.
- Extensive idling or long periods of stop-and-go driving.
- Driving in muddy, dusty, de-iced, or mountain roads.
I believe they apply to most drivers in this country. Are you saying no?
i googled for those definitions, and guess what - they all came up on
iffy-lube type websites selling you 3000 mile oil changes.
bottom line - it's analysis that trumps all cant, sales, superstition or
hysteria on this subject. if the analysis says you can run your oil
longer, and per my original post, most people can, that's the end of the
"honda have indeed done plenty of research and carefully written it into
your owners manual"
If that's the case, there should be no need to do your own analysis. That is
of course unless you think your research is more thorough and bullet-proof
wow, someone actually noticed!!! 10 points.
that cam lobe got marked when i did the head gasket in a hurry and
didn't clean up - it was grit during reassembly and it's been that way
for 51k miles now. as you know if you have experience of this stuff,
for that surface with those same marks to persist this long, without
being scuffed off as normally happens, is a truly extraordinary
testament to a superior lubricant.
google this group for a longer write-up i posted a while ago.
That is not fact it is simply the story you cooked up. Regardless of
what may or may not have happened to your particular engine, it is not
uncommon to see this sort of engine damage happen to someone who
changes oil at 10000 miles and experiences a head gasket leak.
Basically what happens is the sudden introduction of a small amount of
antifreeze into the oil will overwhelm the additives in the oil that are
designed to hold small particles of dirt in suspension. When these tiny
particles that usually do no harm are no longer capable of being held in
suspension, they will agglomerate into larger particles. That is, the
tiny particles will be attracted to each other and form into larger
masses. The damage those larger particles (before they reach the oil
filter) can do looks exactly like the score marks on your cam.
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