Transmission service in West Chester

"Lifetime" fluid isn't

Many makers call their transmission fluid lifetime and schedule no service at all. The companies that build the gearboxes say otherwise — ZF, whose 8-speed automatic is in most newer BMWs and many Audis, Jaguars and Land Rovers, recommends changing it. Fluid wears out. It shears thin, loads up with clutch material and stops protecting the valves that make the shifts. A service at the right time costs a small fraction of the gearbox it protects.

A service made for the unit

We identify the transmission from your car's VIN, not from a guess at the make, and service it the way it was designed to be serviced:

• The fluid made for that gearbox. No universal fluids, ever. A ZF 8-speed gets ZF's own Lifeguard fluid; a Volkswagen, a Volvo or a Mercedes-Benz gets the fluid its unit is specified for.
• The unit's own procedure. Some are a drain and a fill. Some have a pan that comes off, with the filter built into it. Some have an outside filter that we replace every time.
• The level set by temperature. Most modern automatics have no dipstick; the level is set at a plug, with the fluid at the temperature the maker gives. Too much is as harmful as too little.

How often

Most European automatics	ZF's 8-speed, the Aisin units in Volvo and Volkswagen	every 60,000 miles
Dual-clutch gearboxes	Volkswagen DSG, Audi S tronic — by the maker's own schedule, 40,000 miles on the common six-speed DSG	by the schedule
CVTs	With the outside filter, every time	every 30,000 miles
Transfer case and differentials	All-wheel drive — xDrive, quattro, 4MATIC, 4MOTION — and rear-wheel drive	every 30,000 miles

Where your maker's schedule is shorter than ours, the shorter one applies.

When it is already acting up

Harsh or late shifts, a flare between gears, a shudder at steady speed, a clunk into drive, a warning on the dash, fluid on the driveway. Some of these are the fluid. Some are a leak — the seals and the pan on a ZF, a cooler line. Some are electrical: the control unit and its valves live inside the gearbox on most European automatics. And some are wear that no fluid will fix.

So we test before we recommend: the faults stored in the transmission's own control unit, the fluid's level and condition, a road test with live data. That is a diagnosis at a set price, quoted first. Then you get a straight answer — a service, a repair, or a replacement unit — with the estimate.

We also replace clutches on manual cars.

Transmission questions

My owner's manual says the fluid is lifetime. Should I still change it?

Yes. "Lifetime" means the life of the warranty, not of the car. The gearbox builders themselves recommend changing it, and we see the difference in the cars that had it done.

Do you flush transmissions?

We service each unit the way its maker specifies, and for most that is a drain and refill rather than a machine flush — some makers forbid flush machines outright. On a unit that only drains about half its fluid at a time, regular services are what keep the fluid fresh.

It shifts badly. Will new fluid fix it?

Sometimes, when the fluid is old or low. Not when a clutch pack or a valve body is worn — and on a gearbox that is already slipping, a fluid change will not bring it back. That is why we test first.

How do I know which transmission my car has?

You do not need to. Give us the VIN or the plate and we look it up.