Gearbox reflash?
Discussion
Good evening.
It’s been suggested to me that my gearbox could benefit from a reflash.
The car is a 2010 BMW 730D with 145k with the 6-speed ZF transmission. The fluid was changed approx 60k ago.
The gear change is smooth under load but can be snatchy with a light throttle (particularly in Sport-mode) and tends to slur excessively in 2/3 when cold. There’s also more of an engine-brake effect when pulling up to a standstill.
I put this behaviour down to wear, but I stand to be corrected.
It’s been suggested to me that my gearbox could benefit from a reflash.
The car is a 2010 BMW 730D with 145k with the 6-speed ZF transmission. The fluid was changed approx 60k ago.
The gear change is smooth under load but can be snatchy with a light throttle (particularly in Sport-mode) and tends to slur excessively in 2/3 when cold. There’s also more of an engine-brake effect when pulling up to a standstill.
I put this behaviour down to wear, but I stand to be corrected.
I believe there was a software update for the ZF 6 speeds that resolves a poor 2-1 shift (but I think that was earlier boxes from around 2003 ish.)
There is also an adaption process that can be run if you have the right software so the gearbox can re-learn some parameters for smooth shifts.
If the gearbox is worn though it’s unlikely these will resolve symptoms caused by underlying mechanical wear/issues.
A fluid change after 60k probably won’t do any harm. At least then you know it has the right fluid level and not degraded.
There is also an adaption process that can be run if you have the right software so the gearbox can re-learn some parameters for smooth shifts.
If the gearbox is worn though it’s unlikely these will resolve symptoms caused by underlying mechanical wear/issues.
A fluid change after 60k probably won’t do any harm. At least then you know it has the right fluid level and not degraded.
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