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Can Manual Transmission Cars Use Automatic Transmission Gear Oil?

2 Answers

DelClayton

07/28/25 5:52pm

Manual transmission cars can use automatic transmission gear oil. Function of automatic transmission gear oil: Automatic transmission gear oil serves the purpose of lubrication and heat dissipation. Basic functions of gear oil: Used in various gear transmission devices to prevent tooth surface wear, scratches, sintering, etc., extending their service life and improving power transmission efficiency. Gear oil should have excellent anti-wear and load-bearing properties with appropriate viscosity. Additionally, it should possess good thermal oxidation stability, anti-foaming properties, water separation capability, and rust prevention. Hydraulic oil utilizes liquid pressure as the hydraulic medium in hydraulic systems, playing roles in energy transmission, anti-wear, system lubrication, corrosion prevention, rust protection, and cooling.

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RemingtonMarie

08/11/25 11:52pm

The fluid compositions of manual transmissions and automatic transmissions are completely different and should not be mixed. Manual transmission vehicles use gear oil, which protects gears from friction damage and has higher viscosity. Automatic transmissions use automatic transmission fluid (ATF), specifically containing friction modifiers to ensure smooth internal operation. If used in a manual transmission, the lubrication effect would be poor, accelerating gear wear, increasing noise, and potentially leading to complete transmission failure in severe cases. I always remind my friends to check their vehicle’s manual for the recommended fluid before changing it—don’t risk major trouble to save a little money, as replacing a new transmission often costs tens of thousands. Additionally, seasonal temperature changes also affect fluid choice; using the wrong oil in winter may cause starting difficulties, while in summer, overheating becomes a risk. In short, following the rules is both safe and economical.

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