Eni Rotra Bike Synth 75W-90

Worth knowing

The “API GL-4 + GL-5” entry in the Eni data sheet combines two categories with different purposes, and the double label alone does not settle whether the oil suits a particular gearbox or final drive: that is decided by the requirement in the documentation for the motorcycle or scooter. The article on why GL-5 does not replace GL-4 and how 75W-90 differs from 80W-90 explains the difference in detail.

Eni Rotra Bike 80W-90, the only other oil in the line, does not claim GL-5, so it does not meet a GL-5 requirement. In a warm unit the grades coincide: 16 and 14 mm²/s at 100 °C both fall within SAE 90 (13.5-18.5 mm²/s). The data sheets give the cold figures at different temperatures, each for its own W grade: 127,000 mPa·s at -40 °C here and 120,000 mPa·s at -26 °C for the 80W-90; the SAE J306 limit for each grade is 150,000 mPa·s. Eni links the oxidation resistance of the synthetic base to extended change intervals, but only in line with the vehicle manufacturer’s instructions.