Automatic transmissions rely on a pressurised hydraulic circuit to actuate clutch packs, control valve bodies, and engage gear ratios — and the hydraulic filter kit is what keeps that circuit free of the metal particles and friction material debris that accumulate over the service interval. Most kits include one or more internal filter elements, a sump gasket, and in some cases a drain plug seal, providing everything needed for a complete transmission fluid service. The filter media trap particles too small for the sump magnet to capture, and a blocked or degraded filter causes pressure drop across the circuit, leading to delayed, jerky, or hesitant gear changes — often described as a noticeable pause before engaging drive or reverse. Left unaddressed, hydraulic pressure faults can trigger solenoid fault codes and, in severe cases, cause clutch slippage or full transmission failure. Febi Bilstein and VAICO are among the recognised suppliers producing transmission filter kits referenced to OEM specifications for Mercedes-Benz, Audi, VW, Toyota, and BMW applications. Transmission service intervals vary from 40,000 miles on manufacturer-recommended schedules to never on sealed units, but many specialists advise changing the fluid and filter every 60,000 miles regardless to maintain shift quality. Because the filter element shape, bypass valve type, and pan gasket profile are unique to each transmission model, the OE number ensures a complete, compatible kit.
Browse all Automatic transmission hydraulic filter kit in our catalogue
Transmission filter kits are specific to the gearbox model, not just the vehicle — the same car may have been fitted with different transmission units across model years or regional markets. The most reliable approach is to identify the transmission code (usually on a plate on the gearbox housing or in the vehicle data plate in the engine bay), then cross-reference against the OE numbers listed on this page. On Mercedes-Benz 7G-Tronic and Audi Multitronic units in particular, filter geometry and bypass valve calibration differ between production revisions, making the exact OE reference essential.
OEM transmission filter kits from suppliers such as Febi Bilstein or VAICO include filter media, sump gaskets, and seals matched to the transmission manufacturer's specifications. Quality aftermarket kits reproduce these components faithfully. Budget alternatives may use coarser filter media with lower particle retention ratings, or sump gaskets that don't compress reliably in the pan's bolt pattern, risking fluid seeps that contaminate the underside and require reattending shortly after service.
Manufacturer intervals range from 40,000 miles on vehicles with published service schedules to 'lifetime fill' on units that technically have no drain plug. However, many independent transmission specialists recommend changing fluid and filter every 60,000 miles regardless, because ATF degrades from heat, oxidation, and friction material contamination over time. Transmissions presenting with delayed engagement or erratic shift quality often return to normal behaviour after a fluid and filter change, without needing internal repairs — provided the change is made before clutch friction material is fully depleted.
Delayed engagement when selecting drive or reverse — the vehicle pauses for one or two seconds before the clutch grabs — is often the first indication that hydraulic pressure in the circuit is lower than it should be. Rough, jerky, or hesitant upshifts and downshifts, particularly when the transmission is cold, are also common. Dark brown or burnt-smelling ATF when the fluid is checked, rather than the clear red or pink colour of fresh fluid, confirms the fluid and filter are due for replacement. Fault codes for solenoid circuit pressure faults can also be traced back to filter restriction.
Showing 100 of 1,255 Automatic transmission hydraulic filter kit OE numbers. Enter the OE on the main OE search to jump to any reference.
