Synthetic SAE 75W-90 Trans & Diff Lube Lucas Synthetic SAE 75W-90 Gear Oil is a pure-synthetic, non-foaming, super slick, long lasting lubricant designed especially for heavy-duty or high performance applications where other gear lubricants just aren?t good enough. Contains a special additive package that cushions gears and resists ?squeezing out? under extreme pressure situations where other gear lubricants just don?t hold up. We have improved the high speed shock load and significantly improved anti-wear performance which provides the ultimate protection to the gear components. Especially designed to stand up to high temperatures without losing its lubricity. Excellent for use in limited slip differentials.