Many high performance engines and high-end cars now come with their motors broken in.  It is done during the manufacture of the motor, so synthetics can be used.  For other motors the synthetic oils are too slippery to allow the abrasion needed to break in a motor during the first miles.
--

On Fri, 6 Sep 2002 14:12:16
 Kim Brennan wrote:
>In a message dated 9/6/02 1:49:30 PM, mprice@ACMEX.COM writes:
>
>
>> Not so sure how much has to be taken with a grain of salt because when I
>> bought my rebuilt engine from Boston Bob he said not to use synthetic
>> for the first 12,000 miles.
>>
>The V8 in my Lotus came from the factory with synthetic in it.
>

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