That, I think, is true. Note I stated "Especially with old iron blocks."
Newer engines use some fancy schmancy silicon treatment in the cylinder
bores (I think they are sleeved, but not sure, might be the whole block).
The old iron blocks don't have that enhancement, so they need a bit of wear.
Also, I think it has something to do with the fine "sanding" (for lack of a
better term) of the ring edges.
It is all about seating. Nothing to do with the size of the seats tho ;-)
Larry
On 9/1/01 6:53 AM, "Bob Howard" <mgbob@juno.com> wrote:
> I have read that Corvettes leave the factory filled with synthetic. Is
> that true?
> Bob
>
>
> On Sat, 01 Sep 2001 00:15:33 -0400 "James H. Nazarian, Ph.D."
> <microdoc@apk.net> writes:
>> FWIW, BMW's Motorcycle division recommends running in a new engine
>> for 6000-12000
>> miles on dinosaur juice before switching to synthetic. The oil
>> change interval is
>> 6000 and the dealer said BMW advises increasing to 7500 with their
>> synthetic for
>> normal driving.
>>
>> "Larry B. Macy" wrote:
>>
>>> Agreed on all points, but one note. Do not start the new engine on
>>> synthetics. Too slick. The rings won't seat properly. Break-in
>> requires a
>>> bit of wear. Use regular mineral based oil for the first 1000 or
>> so.
>>> Especially with old iron blocks.
>
--
Larry Macy
78 Midget
Keep your top down and your chin up.
Larry B. Macy, Ph.D.
macy@bblmail.psycha.upenn.edu
System Manager/Administrator
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 10 Gates
Philadelphia, PA 19104
Ask a question and you're a fool for three minutes; do not ask a question
and you're a fool for the rest of your life.
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