Hi John, I want you to come to breakfast tomorrow but I've heard the world class T-5 has small
oil capillaries that a high viscosity
oil cannot penetrate. Supposedly, that's one of the reasons the original T-5 used gear
oil and the world class uses ATF. A tranny tech., master mechanic, told me you could add one quart of 30 weight to a world class and not damage the transmission. So like my hair, keep it thin.
David