Gear oil — symptoms of wear

Gear oil works more quietly than engine oil and it’s easy to forget about it. Yet its wear can lead to a costly gearbox repair. It’s worth knowing the symptoms that signal it’s time for a check or a change.

The most common symptoms

• A whine or drone rising with speed
• Hard, resistant gear engagement in a manual gearbox
• Jerks and delays in an automatic or DSG
• Grinding synchronisers during a quick downshift
• Dark oil with a burnt smell during a check

Where these symptoms come from

Worn oil loses its lubricating properties and protects the gears, bearings and synchronisers worse. In automatics and DSGs there’s also a decline in the operation of the clutches and mechatronics, hence the jerking and delays.

Automatic, manual or DSG — a different approach

The symptoms can be similar, but the service scope depends on the gearbox type. In an automatic the ATF oil needs changing despite the “maintenance-free” myth, in a manual the right oil class matters, and in a DSG the key thing is whether the gearbox is wet or dry.

A whine from the gearbox isn’t “the car’s character” — it’s usually the gear oil asking for attention before the cost grows.

If you notice these symptoms, don’t delay a check. We carry out gear oil service as part of our other mobile services.