FIAT 9.55550-MX3

The FIAT 9.55550‑MX3 specification defines the requirements for transmission oils for manual gearboxes installed in passenger and commercial models of the Fiat, Alfa Romeo, Lancia and Ducato brands. Oils that meet this approval must have a viscosity in the range 75 W‑80, comply with the GL‑4/GL‑5 class, provide high oxidation resistance, wear and corrosion protection, and also support proper operation of synchronizers and bearings under high loads. The technical goal is to maintain optimal torque transfer, prevent excessive heating and extend gearbox life without adverse impact on after‑treatment systems, as DPF or catalytic converters are not used in the transmission. The specification covers both traditional 5‑speed manual gearboxes and newer 6‑speed and dual‑clutch automatic gearboxes that require similar lubricating properties. Using oil approved under FIAT 9.55550‑MX3 guarantees compliance with the manufacturer's warranty conditions and ensures stable transmission operation across a wide temperature range.