What type of disc does the 2012 Sharan CD player use? I've bought from several places, and they all show playback errors.

I own a 2014 SsangYong Korando, 2WD high trim, 2.0 gasoline. Recently, the check engine light occasionally turns on with the error code indicating a misfire in cylinder 1. Sometimes it turns off by itself. I've swapped spark plugs between cylinder 1 and 2, ignition coils between cylinder 1 and 3, and even swapped the injectors. I planned to use elimination to check if it's the injector issue, but after each swap, the misfire code for cylinder 1 still comes back eventually! The engine idles with slight vibrations, but I don't feel any power loss on the highway—it easily goes over 160 km/h. Later, I measured the cylinder pressure: cylinder 1 is at 8 kg, while the others are over 10 kg. After researching online, I suspect it's an exhaust valve issue. Now I'm really torn. Should I just let it be, or go for a major repair? I read online that some people can fix it by opening the cylinder head without removing the engine. But the local big auto shop is no more, and the private mechanic suggests removing the engine, which I really don't want to do—worried it won't fit back as perfectly as the original. It's stressful because I bought this as a first car for my father, who has loved cars all his life, and now this happens. I've been to various places without a clear diagnosis. Some say it's slight cylinder wear, some say valve leakage, and others mention cylinder head design flaws. Any advice from fellow Korando owners on how to solve similar issues would be greatly appreciated!

I have a 2017 1.4T with all-wheel drive, driven over 60,000 kilometers in 5 years. When I accelerate to 60-80 km/h, there's a severe jerking, and it's slightly noticeable around 110 km/h too. I've changed the spark plugs and transmission fluid, and checked the engine mounts, but it hasn't helped. No error codes are showing up. Anyone else experiencing this issue? It's really frustrating to drive like this. I've been to several repair shops, even the dealership, and they suggested taking apart the transmission for inspection. 😖😖

Could anyone tell me how to use the CDC changer in the car? The changer shows multiple CD slots, but where do I insert these discs?