I reacted the same way you have with my 2020 GT with Premium. It does not work like my 2013 GT or the way my 2016 GT did. I think they made it smatter and in my opinion less functional and less safe. See my topic...
Go to a mazda dealer and look at a 2.0 and a 2.5. The 2.5 has a balance shaft and the 2.0 does not and the 2.0 is smaller. I think you will see spacing difference around the engines and likely the fan belt side of the engine will be different.
OP, you have talked about rough roads in the past, you may want to step up one size to 235/R 19 to give you more choices and add a little more sidewall for the rough roads...
Glad you got good results but the engine going into limp mode is not from the cleaner valves. More likely the gunk either cleaned or coated the O2 sensors which caused the limp mode and probably changed the O2 input to the engine computer which resulted in the mileage improvement.
I think I would replace due to cracked and broken rubber bushings. If you have movement in the bushing it will not help to align. It is 6 years old and rubber ages...
You might do a 0-60 mph time test and see how much longer it takes than other similar cars and what is posted in car magazines for your year car. Takes the feel out of it with real comparable data within a second or so due to temp etc.
I think this is marketing to benefit the dealers. If they do the replacement work they can install and charge for the higher priced item, but parts department can sell the lower priced product for people who are cost sensitive or independent mechanic shops...
Some wet cell batteries go bad even when fairly new. I have started buying the highest capacity battery that will physically fit in the battery space, prefer one that I can add water for. I also bought a battery tender that puts out less than an amp which comes with a quick disconnect for my...
You might have a bad bearing on the alternator, fan belt tension idler pully or AC compressor as the sound gets louder near the fan belt. I have seen recommendations of using a long screw driver and carefully touch the medal near the bearing and placing your thumb over the opposite end next to...
Try turning your lights on and leaving them on. On recent models the light turn off automatically after a short time and will come back on when you start the car again, not sure about Denmark 2013...
I think there are two oil indicators, one for oil level and one for oil pressure. Even if the level is a bit low you still have oil pressure. If the oil pressure light comes on shut it down immediately and tow it or you can destroy the engine without oil pressure.