Re: Oil Recommended for AU 5spd box
I''ve been around this issue time and time again. Same box in different models and the oil spec changes for no apparent reason, except I think it's more to do with Ford trying to minimise any gear lash noise or neutral rattle etc. that might disturb the precious car occupants.
Some folks think that ATF is unsuitable for manual gearboxes where the gear loads are high. But it does seem to do the job. After some thought I settled on Penrite Xtra light 75W/80 with the Lubrizol 7906 addiitve, which is required to help the synchros. work properly. And it gets changed every 50,000k.