I just read the thread from FCO and I believe Terry is suggesting that you/me/all stay away from Redline MTL in this application.

From Terry's last post -
"...don't get hung up on the viscosity of the lubes here...the MTL appears to have the same additives as a hypoid gear oil that is designed for extreme pressure,which the MTX75 does NOT need.The fact that the MTL carries debris all round the trans appears to be the issue.Just smell MTL and smell a hypoid gear oil...same,then take a smell of Ford XT-M5-QS....the Ford lube does not come close to the others in smell.This is an additive issue....and again an MTX75 does not need ANY 'EP' additives as the MTX75 has none of it's gears with a hypoid gear 'cut'.Also woth noting is that an 'EP' lube with a Quaife or Torsen will REDUCE the effectiveness of the ATB diff.An ATB diff balances torque to each side by the friction 'end load' of the spiral cut diff pinions pressing on the diff carrier case.Using an 'EP" lube will reduce the end thrust friction of these pinions on the case and affetct the torque bias...not good. "


'98 SVT Red/midnight blue - a few mods E0 wheels for sale - PM me