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Lower the window by 11". Remove the door card and sticky foam, cut thru the flexible glue. Loosen the two window clamp bolts and remove the glass, always use a suction cup to hold the glass. Remove the speaker box then disconnect the connectors from the door lock and window motor - access the window connector via the port in the door. Unbolt and remove the window slider frame. I have removed the window motor and gearbox but it is not strictly needed, using T25 remove the DC motor and worm drive. Clean the shaft and apply a mid to heavy grease. The light oil used by Jaguar dries and there is metal contact, greatly slowing the DC motor. With that done replace, paying attention to the brush contacts. Re assembly is a reverse of the procedure. With the glass now in keep the window bolts loose and close the window fully, now tighten the glass clamps. Result: one rejuvenated window motor.

Thanks for your thoughts. That gap is indeed making me think long an hard about the car, especially the first gap where significant miles were covered over a three year period before the oil was changed again. I'm hoping the previous owner (luckily there has only been one) is willing to have a conversation and may well through some light on why those years were skipped. I appreciate that the services aren't cheap, but if spend that amount of money to buy the car new in the first place, you would hope that £400 - £600 isn't too much of an issue. I'm grateful for the other tips, I certainly didn't check the battery but will now. The brakes look okay and it's shod with Pirelli P Zero tyres all round; I do need to check their age though - thanks for the Kwik Fit link, I'll take a look at that. So, I will remain as pragmatic and as unattached as I can, and they are indeed fantastic machines. Thanks again for your thoughts, and yes, I am thinking long and hard!

Thanks for taking the time to share your thoughts. I've heard the engine is pretty robust, and indeed the car has been serviced generally in line with the 10,000 miles recommend, just not to JLR's schedule. It is a particularly nice late example, with low mileage and one owner. The dealer so far is accommodating, and at my request is trying to see if the previous owner would be willing to give me a call. I have driven it, but need a longer test drive if the truth be told. It's passed all my HP/ Car Vertical checks and I'm also going to have it inspected by a local Jaguar specialist. If all that checks out, then I'll pull the trigger. However, despite best efforts, the rest really is in the hand of the gods! I'm encouraged to hear your higher mileage XF is providing effortless, reliable and relaxing motoring. Fingers crossed, I'm heading the same way! Thanks again.