ZF transmission fluid change 2003 XK8
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Best of luck, keep us posted.
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My understanding is that the car needs to be driven through a number of specific conditions, each one suggested by the computer, and somehow marked off when completed by the driver. I assume it has to do with modifying the learned PWM of each of the solenoids as the fluid characteristics are changed. It is supposed to be followed by 100 miles of normal driving done by the owner, in order to let the software adaptations smooth things some more based on the particulars of your transmission clutches, etc. Following this logic, it seems that any software adaptation is limited to the first 100 miles after this "reset". No further adaptation is taking place after that.
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Keep in mind that a pan drop combined with an ATF refill typically refreshes between 5 and 6 litres of the 10-litre capacity of the ZF 6HP26 transmission. A simple drain-and-fill without dropping the pan typically refreshes only about 4 litres. So to completely eliminate your "ZF squawk", you may need to do another drain-and-fill. The more old ATF you drain and replace, the greater your chances of silencing that squawk....
I continue to believe that Mercon SP ATF is just fine for these 6HP26 units that are now out of warranty. It meets the required Shell M1375.4 specs. Mercon SP ATF continues to work quite well in both of our Jaguars....
I continue to believe that Mercon SP ATF is just fine for these 6HP26 units that are now out of warranty. It meets the required Shell M1375.4 specs. Mercon SP ATF continues to work quite well in both of our Jaguars....
Last edited by Jon89; 05-31-2016 at 07:43 PM.
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