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Meta description: Not sure whether to use 80w90 or 85w140 gear oil? This clear, expert guide compares viscosity, real-world uses, pros and cons, and synthetic vs conventional options—plus FAQs—to help you choose the right differential or manual transmission oil. Gear oil protects the gears, bearings, and shafts in your differential, manual transmission, and (on some…

Quick Answer: ISO 68 is thicker than ISO 46. But “thicker” doesn’t always mean “better.” The right choice depends on your machine, climate, and workload — not just the number. Think of hydraulic oil like blood for your machinery — it powers movement, cools parts, and keeps everything from grinding to dust. But pick the wrong “thickness,”…