When I got the car it had trans
oil in it, and I assume it had it for 6 years prior. Don't know if it's world class or not, but I know that for almost 9 years now it has run in
oil. When I switched initially from regular
oil to a teflon based
synthetic trans oil, it shifted much improved. When I switched recently between the teflon based
synthetic oil to
synthetic mixed with 30 to 40% Lucas shifting is off the hook. It's not as much a heavy oil as it changes the lubricant you are already using to stay on the moving parts and not come off. Dave, I'll let you drive my car around the block if you want so you can see for yourself that it's off the hook. -John