2 things, going longer then normal between oil changes just cause your using
synthetic is NOT a good idea

To qualify as "synthetic blend" all you need to do is put SOME synthetic oil
in it. So technically it could be plain oil with 1 drop of synthetic oil
added.

If you want synthetic, then get 100% synthetic oil

"Bob Palmer" <jenbobkatelyn@adelphia.net> wrote in message
news:b-qdnb8UFKku4NnenZ2dnUVZ_smdnZ2d@adelphia.com...
>I just had an oil change at 67,500 miles on my 2000 Odyssey and the
>dealership used Castrol Syntec Blend oil which claims it is part synthetic.
>Has anyone had any experience with this oil and is it ok to use after using
>regular oil for 6 years?
>