They do use different gearbox oil from the Gen 1 to gen 2 mps3 acording to the Castrol web site.
GEN 1:
MANUAL TRANSMISSION
CASTROL VMX-M 75W-85
or CASTROL SYNTRANS 75W-85
Service Refill Capacity: 2.5 Litres.
GEN 2:
MANUAL TRANSMISSION
CASTROL VMX 80
Mild extreme pressure gear oil with special viscosity stabilisers to overcome shift problems. Recommended for use in transaxles of most front wheel drive vehicles with a transverse engine and manual transmissions experiencing low temperature shift problems. SAE 75W/80, API GL4.
Service Refill Capacity: 2.5 Litres.
Had:
Mitsubishi Evolution III ~12.0@114mph~
Mitsubishi Evolution VII ~12.8@106mph~
06 MPS 3 True Red
Now:
~07 Ralliart Colt ~14.85@96mph~
~2010 Velocity Red Luxury MPS 3.
3" CAI, K&N, Race pipe, Silicone Intake pipe, Custom Intercooler heat shield, LED Conversion, Gloss Black Wheels.