Transmission
Gearbox Oil — Why It Matters and When to Change It
Gearbox oil lubricates and cools the transmission. Old or low oil causes hard shifting, noise, and eventual gearbox failure.
Both manual and automatic gearboxes rely on oil for lubrication, cooling, and hydraulic operation. Over time, the oil breaks down, becomes contaminated with metal particles from normal wear, and loses its protective properties. Symptoms of degraded gearbox oil include difficult gear engagement, whining noises, and increased operating temperature. While some manufacturers claim a gearbox is sealed for life, most independent specialists recommend changing the oil every 30,000–60,000 miles for heavily used vehicles. Using the correct specification oil is critical — the wrong type can cause immediate damage.
Key takeaways
- Old gearbox oil causes hard shifting, noise, and overheating
- Sealed-for-life claims are not suitable for heavily used vehicles
- Always use the manufacturer-specified oil grade for your gearbox
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