[Mugzee]

Thank you Oli, that's good to know. It's annoying as even though that was the last time the transmission was touched, I have no real way of proving that. They also only carried out a drain and fill and didn't renew the filter, even though they were requested to do so.

I spoke with Tim from ZF and he said that it's probably bad news. Mineral based fluids are usually red and when introduced into the gearbox can and will damage clutch plates and seals, even the possibility of de-laminating clutches. Mineral and synthetic oils don't mix well and he said that is probably what's causing the issue. Without getting the old fluid analysed, it's obviously difficult to tell exactly what it was.

On another test drive to try and determine when the fault arises, it went into limp mode with 17114 - gear ratio monitoring fault code.

I may try another fluid change to see if that helps.