Who do you believe? The engineer from Honda or a simple
technician? To have credibility, the tech better have science
facts to support his speculation. No solid facts neither
based upon science nor supported by numbers? Then he is
probably promoting junk science.

This is not just how one selects motor oil. Some are so
foolish as to believe the junk science reasoning from
mouthwash manufacturer such as Listerene and Scope. If their
reasoning was correct, then Vodka is a better mouthwash and is
superior to a tooth brush with fluoride toothpaste. Where is
the science that says mouthwash is so effective? Same
mythological reasoning.

Consult Honda. If the tech says otherwise then hold his
feet to the fire. Either he will provide those facts (an
honest man) or he will get emotional (symptoms of a myth
purveyor).

eh wrote:
> Dear experts,
>
> I have a 98 Accord that has 80K on it. Last week
> I went an independent deader to get my oil changed.
> The technician told me that I should be filling 10-30
> or 10-40 oil since my car has a lot of mileage on it.
> He said these oil protects older engine better.
> The car manual specified to use 5-30 and nothing
> else. Is the technician right?
>
> Thanks,
> Eugene