I have an 02 6 spd and am going to change the oil in it. Can I use a Manual Transmission lube in it instead of the ATF fluids. I bought some Valvoline Maxlife ATF to put in the trans and transfer case and just wondered if I would be better off with regular mtf in just the trans. I will put the atf in the transfer case. Truck does not get drove in the winter and it lives on a horse trailer thru the summer.