On Wed, 31 Aug 2011 18:58:01 -0700, SMS
wrote:

On 8/31/2011 5:34 PM, wrote:

And the CURRENTLY RECOMMENDED AND SUPPLIED oils do NOT damage the cat.
They have almost totally removed the zinc and phosphorous extreme
pressure additives from all the oils from 10W40 down

That's correct, except for many of the Amsoil products which should not
be used in vehicles with catalytic converters.
They shouldn't be used in anything worth more than the oil, in my
opinion.