Three months ago I purchased used XF x260 3.0 SC MY2017. I had coolant level was on min level. So I topped it up to max and it stayed there so frequency of my checking dropped down. Yesterday I checked coolant again after approx. one month and 1000km (from 600km were done last week during vacation trip) and I can see liquid level is right in the middle between low and max level. (I will do check again on different place to rule out surface is not fully flat)
Shall I be worried or small decrease can be normal?

Car was inspected before purchase and also after purchase during regular maintenance by different shop and no evidence of leak found.

Or shall I just go ahead and do preventive replacement with for example these parts? Jaguar Land Rover Cooling System Replace Kit 3.0 V6 5.0 V8 Supercharged Engine | eBay

 

Is the car under warranty where you purchased it? If it is, bring it back.
You stated it was inspected by different shops after the purchase and found no evidence of leak? When the engine is hot, do you smell coolant (smells sweet).
Open the engine cap. Do you see something resembles to this?

 

Thanks, car doesn't have traditional warranty. It is covered with something like insurance. Cooling system and faults caused by cooling failure is however unfortunately excluded.
Oil cap is nice and clean without any residuals or foam.
After longer run I could smell something which is not there after shorter ones but I would not call it sweet. It feels more like if you warm a lot some non-biological material. I first thought it smelled from plastics and or noise dampening materials and similar.
From your response I understand it is not normal to have basically any disappearing of coolant. I think I will get it inspected again. Maybe they haven't properly checked tricky parts like pipes under supercharger.
Thank you.

 

Best to detect leaks is with a coolant pressure tester but if they don't, have them remove the undertray and inspect at the bottom of the engine and if there are any leaks it should be trapped on the tray. You need the car raised in a hydraulic lifter to get a good view from underneath.
I noticed you are in Czech Republic. Google translated it for me >>>> Hodně štěstí

 

Meanwhile I run approx. 400+ more km without further leak. I had quick check in JLR authorized shop and potentially it looks like somebody was doing maintenance on cooling system and because of setup complexity (a LOT of tubes and houses) it may be there were some gas still left which suddenly made its way out.
However I am not that convinced so full pressure test and check is scheduled in two weeks time.
I will post update here afterwards.

 

This was my case almost exactly. I bought my car three months ago with min level coolant. It stayed the same for a while and then suddenly started dumping coolant on the highway. The water pump might be on its way out.

 

So car was checked thoroughly and no water leak. Currently we agreed I will not fill liquid and keep it in the "middle" and we put mark on expansion tank. So monitoring it.
Other issues found:
- leaking front differential
- bad front arms
- oil leak from engine but currently unknown source

 

Oil leak may be from vacuum pump, which is a common place for an oil leak.