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**Shell Spirax MB 90** is a heavy-duty automotive gear lubricant formulated for manual transmissions and axle drives in commercial vehicles and passenger cars. Developed with high-quality mineral base oils and specialized extreme-pressure additives, it provides strong protection against gear wear, scuffing, and pitting. Its SAE 90 viscosity grade maintains a durable protective oil film under high load and high-temperature conditions. The oil exhibits good thermal and oxidation stability to minimize sludge formation and extend fluid service life. Additionally, it offers effective protection against rust and corrosion while ensuring compatibility with standard transmission seals to prevent oil leaks.