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This is from the service box under Gearbox / Repair Procedures / General Specifications: ML6C reinforced manual gearbox and the pictures there show the cooling fins as in your photo - 2.1. DataThe ML6C Reinforced gearbox is a development of the ML6C gearbox :New clutch housingGearbox casing with fins for improved coolingNew reinforced 5-6 hubNew hydraulic concentric clutch stop which directly activates the clutch mechanism by action on the pedal without passing via a forkTransmission torque : 370 Nm (limit 350 N.m in 1st, 2nd and reverse gear) 8. LubricationCAUTION : The ML6C type Reinforced gearbox has a different oil capacity to that of the ML6C gearbox.Oil capacity (after draining) : 1,9 litre.Oil capacity (after an operation on the gearbox) : 2,2 litres.Check the oil level : No check of level (*).Lubricated for life.N.B. : (*) Make a visual check of the sealing at each engine draining operation.ESSENTIAL : It is essential to drain the gearbox and refill it with the exact quantity of oil in the event of an external leak and after a repair.