Great responce. This is the opinion of my teacher Ieronim Ioachim Hagedorn
Freicherr von Keuznach (admirer of Baron Muenchgausen!), pronounced in heavy
German.  Ark.

George Lyle wrote:

> ZR72@aol.com wrote:
>
> > i admit you are real close on your math.  except you have omitted two
> > important factors.
> > you have not included the price of the filters for 4 oil changes
> during the
> > 12,000 miles.  and synthetics go a MINIMUM of 7500 miles before
> being changed.
>
> Is this to say that synthetics somehow prevent outside debris from
> getting into the oil?  The purpose of an oil filter is to remove this
> debris from the oil.  Unless synthetics magically repel dust and
> blowby then the oil filter change intervals should remain the same as
> they would be for conventional oils.  Leaving the filter in for longer
> than recommended risks getting it clogged, which will cost a lot more
> than the money you will save!
>
> Without decent filtering, long oil change intervals are not possible.
> Even with filters, long change intervals are still dubious, as not all
> oil impurities are solids.  Some are corrosive liquids!
>
> George Lyle
> _________________________________________________________
>
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