Regarding synthetics in general --

"the AAA study didn�t go light on the research and took a comprehensive
look into all the factors involved."

�AAA found that synthetic oil outperformed conventional oil by an
average of nearly 50 percent in its independent evaluation, offering
vehicles significantly better engine protection for only $5 more per
month when following a factory-recommended oil change schedule.�


http://blog.jackcarterchev.ca/new-st...ns-car-owners/

IMHO, motor oil is one thing, gear lube is another.

I posted the link/info due to the conversation turning to
synthetics so frequently.