BMW 3 series automatic transmission slip.?

I have face a slip of my transmittion after driving for a while. When i shift to drive mode.It would slip during shiftting from 2nd gear to 3rd gear.Then retain at 20-30km/h & rpm keep on roarning No display indication.The trouble was the mechanic had changed tranny oil with a different spec.How can i save... show more I have face a slip of my transmittion after driving for a while.
When i shift to drive mode.It would slip during shiftting from 2nd gear to 3rd gear.Then retain at 20-30km/h & rpm keep on roarning
No display indication.The trouble was the mechanic had changed tranny oil with a different spec.How can i save save the transmission?Thanks
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