When it comes to maintaining your diesel, fuel filter, and oil changes tend to get all the attention, but transmission service is just as critical to keep your vehicle running smoothly. Whether you drive a VW TDI with a DSG transmission, a Mercedes BlueTEC with a 7-speed automatic, or a BMW diesel with a ZF gearbox, replacing the transmission fluid and the filter should be part of your regular maintenance routine.
Transmission fluid plays a crucial role: it lubricates internal components, keeps temperatures within the appropriate range, and provides smooth shifting. Over time, that fluid starts to break down due to heat and wear. Small metal particles from clutches and gears start to build up, contaminating the fluid and if the transmission has one; clogging the transmission filter. When changing the fluid, you will often notice a drastic color difference:
Failing to service the transmission can lead to hard shifts, slipping, overheating, and eventually, total transmission failure. Transmission replacements are not cheap, so it is best to keep up with the correct maintenance interval for your transmission.
Filtered vs. Sealed: Know Your Transmission
Some modern transmissions, like the Aisin transmission found in the Chevy Cruze Diesel are considered “sealed” and do not contain a filter; but that doesn’t mean they’re maintenance-free. These units will still require fluid changes to ensure smooth shifting, even though the manufacturer may claim it is a “lifetime fill”. Other vehicles, like many Mercedes or BMW automatics, include a filter and pan gasket that should be replaced along with the fluid.
At IDParts.com, we carry full transmission service kits for the diesel vehicles we support, including OEM and high-quality aftermarket fluid, filters, and gaskets. Each kit is curated to match the exact specifications of your vehicle, taking out the guesswork and making DIY maintenance more accessible.
Bottom Line
Servicing your transmission with fresh fluid and a new filter when required is one of the best ways to protect your vehicle. It improves shift quality, extends the life of your transmission, and helps avoid costly repairs down the road!
If your diesel vehicle is approaching 40,000 to 60,000 miles since the last service (or if it’s never been done), now is the time.
Resources:
Helpful Transmission Service Video for the Automatic ALH TDI:
Click below to view Transmission Service Kits with OEM Components:
Article: Learn about the DSG Transmission
