if you google 'ZF 6HP26' there is a heap of good info to digest, on Jag sites and RR sites

couple of things i noted were that if you have a 1 kmph variation in front wheel speed when going straight ahead it can give problems, so keep those tyres wear and pressures equal

some have reported that changing the fluid has made a difference ( i have personally experienced this) its recommended to do a dual flush where you re do the flush after a couple of days, apparently clutch materials can get on connectors and give problems!!

there are reports to NOT deviate from the manufacturers oil, ZF say that the trans is set up to different viscosity and drag coefficient oils to suit the specific car the trans is intended to be used in and as such using a similar or different brand oil can have varying effects

there are also a couple of PDF,s you can down load that explain how to dismantle and repair the trans and also a fault finding chart, also good reading

Ewen

Just trying to huntbdown 20 litres of lifeguard 6 tranny fluid so I can swap it

Ok so here is the verdict!

Changed the fluid with genuine ZF Lifeguard 6 and the lurch is GONE!

So all those out there who want to give it a go I suggest it - Don't be a tightarse and try and put some other fluid in it cause you will most likely screw your transmission. ZF Lifeguard 6 for the 6 speed and Lifeguard 5 for the 5 speed.

If when you pull the plug and inspect the fluid and it is severely burnt and you see metal shades in the fluid put the plug back in because your too late and the tranny is toast!

The "Lifetime fluid" rant from BMW is CRAP! Even the engineer from ZF said that they recommend replacing the fluid at 100K as that is deemed "Lifetime" and earlier if the vehicle has towed anything in its life.

GOOD LUCK

Where did you get lifeguard 6 from?

In case it helps, ZF Lifeguardfluid6 is actually Shell ATF M1375.4 and the same fluid is sold as :

Aston Martin - Part No. 4G4319A509/AA/S
Audi / VW - Part No. G 055005 A1 / A2 / A6
Bentley - Part No. PY112995PA
BMW - Part No. 8322 0142516
Hyundai - Part No. 040000C90SG
Jaguar - Part No. Jaguar Fluid 8432
Land Rover - Part No. TYK500050
Maserati - Part No. 231603

I can’t imagine Aston Martin, Bentley or Maserati parts departments selling it cheaply but Hyundai might be worth a try!

Phil

How long have you been driving on the new fluid? Too soon to tell I suspect.

You can buy it from Imparts, about $550. I had my flushed by a machine so it gets rid of almost all the old fluid and leaves you enough in the drum for a second flush if you want to.

About 4 days, but I used to get the lurch constantly. Im not 100% convinced at the moment but 99% there.

Will updated if there is any change

Dcashion
Thank you for the info. Will follow up. :thumbup:

Give it at least a couple of weeks. Mine seems to drive better for about 1 or 2 weeks after a software reset then it goes back to it's old lurching ways. I hope it's not the case for you.