
The Esso/Exxon MTF LT-1 gear oil was the spec transmission fluid from this date. In 2004 BMW switched suppliers to Castrol and the new fluid was designated MTF LT-2. According to BMW, LT-1 and LT-2 have the same properties and can be mixed or substituted. I recently purchased a 5 liter container of MTF LT-2 using my CCA discount and found that it's a 75w-80 grade gear oil. Therefore, a 80w-XX or 85w-XX should be avoided if you're not going to use the OEM fluid. From model year 2006, MTF LT-3 became the required fill for all manual transmissions with the N52 engine.
d apres mon reste d anglais il dit que la LT1 et LT2 sont pratiquement identique,compatible, surtout qu elles ont les memes propriétés que la castrol 75w80 et valable pour ttes les MTF jusqu en 2006 ( qui passe a la LT3 )
N hesitez pas, si je me suis trompé !!