That said, having converted
> my dino burning low-mileage (38K) WBX to synthetic when I got in almost two
> years ago, I experienced no leaks.  However, I did experience a lot of what
> I guess they call "blow-by."

This echoes the experiences of some of my gearhead friends that waited
too long to make the switch to synthetic.  Ideally, it should be done as
soon as the rings are properly seated.  This point is easily
identifiable if you have a quality temperature gauge and are meticulous
about oil consumption monitoring during break-in.  I don't like to wait
more than 5000 miles to make the change to Mobil 1.  With my current
Honda, I had to wait 3750 miles to satisfy warranty requirements, but I
could have switched as early as 600 miles based on oil consumption alone.

Mike Snow