My understanding is that this is an issue with Gas Direct Injection engines. There's information online about them so I won't go into it here.
GDI engines carbon up behind the valves because the injection is directly into the cylinder after the valves. The very fine mist that gives the GDI's their increased power and fuel mileage also causes soot which gets by the rings and into the oil. It is this soot that blocked the passages in the tensioners causing them to stick leading to the attendant problems with loose chains. My reading led me to believing that by 2013 JLR was on the 3rd revision of the tensioners. I don't know if this issue has been fully resolved. I sold my car partly because of it.
As I understand, JLR had a contract with Castrol for a very specific version of oil that was noted in a leaflet in the owner's manual, NOT the oil specified in the manual itself. The local JLR store was using the wrong version and eventually went to another Castrol supplier to get the correct version. At the time, not even Amsoil had a recommendation for a comparable oil. I believe they do now.
My personal opinion and I am only a DIY'er, is that I won't buy any GDI car, especially a turbo'ed one. Explained this GDI situation to a friend before he bought a new truck with a turbo GDI and he didn't listen. 2 years later he was faced with a $3000 bill for chains, tensioners, guides, etc. and decided to buy another vehicle entirely.
From my reading on the subject, there is no solution to this problem for any GDI engine. They are even adding injectors to the intake manifolds again, port injection, to keep the backsides of the valves clean. But, that doesn't stop the soot blow-by at the rings. I've been an Amsoil dealer for personal use only since ~1974. If I were to take the chance again, and I don't plan to, I'd run the recommended Amsoil product at very reduced oil change intervals. But, this is personal opinion based on my using Amsoil in everything I've owned for 36 years. That's at least 36 cars or more for me. Yes, I'm afflicted....
Hope some of this helps.