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Posted

Hello all, belated Happy New Year.

I am thinking that the transmission Oil in my 2013 XK should be changed -  the car has done 53000 miles and obviously is 12 years old ( as is the transmission oil).

The owners manual does not address transmission Oil at all and i have seen in online research that Jaguar says that the transmission Oil is in the transmission for life.

All that heating up and cooling down plus the stresses and strains of the mechanical operation in the gearbox over the years causes me to think that the oil may be past it;s best and makes me uneasy.

What is the conventional wisdom on this please.

Best, Don

 


Posted

Hi

Opinion varies but this is from the Jaguar Workshop manual pg 2201; http://www.jagrepair.com/images/AutoRepairPhotos/CarPDFFiles/2007XK/X150Service.pdf

The 6HP26 transmission has the following features:
• Designed to be maintenance free
• Transmission fluid is 'fill for life'
• The torque converter features a controlled slip feature with electronically regulated
control of lock-up, creating a smooth transition to the fully locked condition
• Shift programs controlled by the TCM
• Connected to the Engine Control Module (ECM) via the high speed Controller Area
Network (CAN) bus for communications
• Default mode if major faults occur
• Diagnostics available from the TCM via the CAN

.... My choice has always been to leave "sealed for life" systems alone. Your choice 🙂

Posted

As always there are different schools of thought on the "sealed for life" dichotomy. One thread says there is unreadable small print that actually says "sealed for the life of when we, the manufacturer, has warranty liability" for the gearbox / transmission.

The other school leans towards the mechanical sympathy argument and implies that the gearbox fluids should be changed at circa 60k miles. There is quite a complex procedure for changing the transmission fluid in a Modern XK, which involves draining the gearbox and changing the filter, topping the fluid up via the level plug - there is no actual fill plug - and leaving overnight to settle. Throw in the fact that the routine has to be undertaken at various temperature settings, involving running up to temperature, allowing to cool down and then back up to temperature for more level checks, it is all a shade worrying that leads folks to the "leave well alone" school.

Throw in the element that you cannot drain all of the fluid - there is the circuit via the cooler - and it does get to the point of let's just leave it as "sealed for life"!

N6 JMX

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