Oil for a manual gearbox — how often to change it?

The oil in a manual gearbox has a different role from engine oil — it lubricates the gears, synchronisers and bearings. It works in less extreme conditions, so it lasts longer, but contrary to appearances it isn’t forever.

Which oil for a manual

Manual gearboxes require a gear oil of the right class (most often API GL-4, less often GL-5) and the viscosity specified by the manufacturer. The wrong class can damage the synchronisers — so the choice isn’t guesswork.

• API GL-4 or GL-5 class as recommended by the manufacturer
• The right gear viscosity (e.g. 75W80, 75W90)
• Never “by eye” — the wrong class harms the synchronisers
• Selected by VIN or the owner’s manual

How often to change it

The interval depends on the car but usually falls between 60,000 and 120,000 km. Intensive city driving, frequent gear changes and towing shorten this period.

Signs of worn gearbox oil

• Harder gear engagement, especially when cold
• Grinding during a quick gear change
• A whine or drone rising with speed
• Resistance when engaging reverse

A whine and hard gears are typical signals that are easily confused with other drivetrain faults.

Manual gearbox oil is changed rarely, but when it must be — the wrong class can cost a whole set of synchronisers.

We carry out manual gearbox oil changes as part of our other mobile services — we’ll select the right class and viscosity for your car.