Thanks for that bit of info and the link - very interesting reading.
I would still stick to my findings for passenger cars and trucks - it's easy to find this info on the net and easy to see in practice (as did Don). As a distributor, you would know best that oils for the heavy truck industry use much more robust additives that increased shear rating stocks, as well as seal conditioning additives that are obviously superior than where the first gen oils (as stated in your link). I'm pretty sure newer passenger car&truck rated synthetics have been improved in these areas as well, but there's still a lot of facts out there that support the alternate.
After studing this issue for a few years now, I think the best uses for the new synthetics are in newer engines with tight tolerances and in cold-weather application. The reduced viscocity at low temps is a real benefit in the Northern climates.
Right or wrong, but based on the available evidence, I use mineral oils in all my 2000 and older vehicles and synthetics in anything newer.
