96 318ic/m44/auto lost automatic transmission fluid

[applefan]

was on the way home last friday , going around 40mph, all of a sudden transmission error light came on and it stopped shifting. couldn't pull over immediately as it was a narrow street with no shoulder.

Anyway, long story short, I had to tow the car home. When looked at it few days ago, the nut that holds the atf cooling line came loose and squirting atf fluid out. tightened it , no more leaks now, but car won't move since it emptied most of the precious lifetime fluid while it gave problem last friday.

any recommendation what fluid can be used on these sealed trannys with life time fluid ? and how long will it run before it needs changed again?
Transmission is A4S 310R/auto and the green label on it not readable at all Thanks!