All three of my Volvos and a Ford Ranger 4X4 have had their powertrains (engines & transmissions) recently converted to Amsoil synthetic products.
I do not derive any benefit from promoting Amsoil products, although I feel good when friends, having taken my advice, realize the same benefits from their use that I do.

Some of the immediate results include:

1) increased economy, most pronounced in the 960.
2) smoother operation, as in quicker takeoff, almost imperceptable shifting,etc.
3) cooler operation, noticeably so in this 95+ heat and congested expressways
here in the Chicago area. Cooler powertrains = better air conditioning

These are just some of the immediate benefits. The smoothness seems to improve by the day, a rehabilitative effect perhaps, cleaning up all the degraded petroleum by-products, and opening up the pathways and channels in the engines and transmissions as designed. All of these vehicles were meticulously well maintained and not in any apparent need of rehabilitation. These products enable them to perform so much better.

I don't need any industry standard to lead me in the right direction, think about it. Has the "industry" ever been mistaken? Petroleum oil has never been the best lubricater, but it was all that was offered. Now we have something much better.

If I were to lease a vehicle for a year or two I would convert it to Amsoil, if only for the increased economy, smoothness, and cooler operation. The conversion would pay for itself in a short time.

When I last picked up Amsoil products at their Bensenville, Illinois distribution center I had occasion to converse with a customer. He noticed that I wasn't buying any gear lube.(Series 2000 75-90) He said he considers the gear lube to be the best product that they sell, and fuel economy increased between 4-5% in every vehicle he has put it in.

The gear lube will another project.