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After a gearbox leak repair I need to replace the trans fluid on my manual Mini Cooper non-S 2010 LCI.
I'm searching for a synthetic MTF LT-4 API GL4 75w80 (as required for this gearbox).
There is not any MTF complying BMW MTF LT-4 in my country (South America).
After days of research I could find that local Liqui Moly brand is not selling anymore the TOP TEC MTF 5200 75W80 GL4 (BMW MTF LT-2 & BMW MTF LT-4 specs).

BMW is not selling trans fluid since "you have a lifetime trans fluid"
Other brands (Motul, Castrol, etc) are selling GL4+ (GL4 + GL5) and mineral GL4.

Liqui Moly is calling me to offer the TOP TEC MTF 5100 75W instead of TOP TEC MTF 5200 75W80
TOP TEC MTF 5100 75W is a mineral API GL4 trans fluid with BMW MTF LT-3 spec (but not BMW MTF LT-4)

Anyone can help me about what's the difference between BMW MTF LT-3 and BMW MTF LT-4 specs?
It's related with lifetime and change interval (due a mineral must be changed more often that synthetics) only?
I can't find these BMW MTF LT-n real and exact specs comparisson on the internet
 

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75/80 mtf is same as below oils
orresponds with requirements / specifications / products:
SAE 75W-80
API GL-4
BMW MTF LT-1/-2/-3/-4
MB 235.10
FORD WSS-M2C200-D2
TOYOTA JWS 227
PSA B 71 2330
PEUGEOT 9730A2/A8
VW G009 317 / G052 171 G052
VW G052 178 / G052 512 G052
VW G052 532 / G052 527
VW G052 726 / G052 798
VW G055 726
NISSAN 999MP-MTF20P KE91699932R
MITSUBISHI MZ312644 3005401
this all said i use a generic brand fully synthetic gl4 SAE 75W-80 i also add molyslip gearbox treatment as well , link below for idea
additive, on gen 1 cars really does help the weak gearboxes
https://www.ebay.co.uk/itm/Molyslip...637891?hash=item41dc2a5c43:g:BtoAAOSwZyRal~17
 
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