Transmission flush versus transmission oil change

‘Lifetime filling’ and ‘maintenance free’ – two terms still used by many manufacturers these days. While this may be possible in theory, the reality is often quite different. According to Meyle, the truth is that with age and lack of maintenance, even the best oil can no longer fulfil its role. In this article, the German aftermarket parts manufacturer differentiates between a transmission flush versus a transmission oil change.

Transmission flush versus transmission oil change
Professional service is essential not only to ensure that the vehicle continues to run smoothly, but also to keep all key components properly lubricated and power transmission and cooling constant. Any change in the characteristics of the ATF – for example, due to ageing – has a direct effect on both the functioning of the automatic transmission and its service life.

When do I need a transmission flush and when an oil change?
Signs that the transmission oil should be changed are easy to identify: There is poor starting or vibration. However, stuttering and delayed gear changes indicate that a simple transmission oil change is no longer sufficient and that a transmission flush may be required.

Good to know: For automatic transmissions with a particularly high mileage of over 150,000 km, a transmission flush should be carefully considered, as the mechanical load can quickly cause damage to sensitive components and cause the automatic transmission to become useless. Therefor individual consideration, including the procedure, is necessary at all times!

What do I need to look for when changing the oil?
As the oil ages, not only does the viscosity of the oil decrease, but the additives added to the oil also begin to deplete. By simply checking oil level and tightness, as many manufacturers still recommend, there is a risk that a much-needed oil change may be overlooked.

This is particularly relevant for automatic transmissions with wet clutches, where the friction lining floats in the transmission oil, as different types of abrasion can accumulate in the oil. Although the hydraulic filter can absorb some of the abrasion and thus prevent build-up, sooner or later all filter media becomes saturated resulting in damage to the components. Affected areas include tooth flanks and running surfaces of the gear wheels.

Meyle recommends changing the oil after 80,000 – 120,000 kilometres to prevent damage to the transmission, while also noting manufacturer’s instructions. The company adds that transmission oil changes are as easy as it gets when using Meyle oil change kits.