Pentosin FFL-4 vs MTF2
 

Hey guys,

I just ordered three bottles of Pentosin MTF2 from new-part.com to do a manual transmission change, and what I ordered was not quite what I received.

They gave me one bottle of MTF2, and two bottles of FFL-4. I've been doing some googling and it seems that FFL-4 is slated to replace MTF2 in some BMWs, but not sure how that applies to the BRZ. I found these spec sheets from Pentosin - the MTF2 is explicitly listed as being GL-4, but there's no mention of GL-4 or GL-5 with the FFL-4's spec sheet, and I know GL-5 is bad news for our gearboxes.

MTF2: http://www.pentosin.net/specsheets/Pentosin_MTF-2.pdf
FFL-4: http://www.pentosin.net/specsheets/pentosin_ffl-4.pdf

It would make sense if the 4 in FFL-4 was referring to GL-4 spec, but at the same time a couple websites I've come across have said not to mix the FFL-4 with anything else, and I'm not sure why. I'd like to be absolutely sure this oil is safe before using it, and I'm leaning towards sending it back since it's not what I ordered. Any thoughts?

(ordered from these guys since they were cheap... might be learning another lesson here...)