jim beam wrote:
> here's my last oil analysis:
>
> aluminum 3
> chromium 1
> iron 23
> copper 6
> lead 2
> tin 0
>
> cSt viscosity at 100C 10.18
> insolubles 0.3%
>
> what was my change interval? bonus points for the brand of oil.
well, as the keen students of google were quickly able to ascertain, it
was indeed 12k miles. full credits to to them, especially to joe who
got the oil right, but i award a "good effort" to al for castrol since
that is my #2 choice.
those numbers are pretty darned good btw, and if you care to check other
analysis figures from other engine types others have posted around the
web, you'll realize that honda make a darned freakin' good engine based
on the iron content. iron is mostly cam wear and numbers in the
hundreds are not uncommon for other makes of engine.
expanding further on the iron thing, the main reason i got this analysis
done this time was because a couple of years ago, i had to do a quickie
head gasket change, and simply didn't have the time to practice proper
cleanliness. the cam got some grit on it, and thus got some big old
scrape marks on it as some grit particles got trapped and dragged on
around the lobes. i changed the oil again the following weekend, and
left it thinking this would be my op****tunity to go for a jdm motor
change in the not too distant. well, here we are running mobil 1 a
couple of changes later, the motor still runs like a champ, and the cam
lobes look exactly identical, all scraped up!!! with a normal oil, i
would have expected the worst of it to have worn down by now as part of
the normal overall abrasion process. however, it appears that wear,
even on these uneven surfaces, is absolutely minute. great oil - i
recommend it.
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