I bought my daughter's Mini Cooper with run flats as I didn't want her stranded on some lonely motor in the dead of night. So in terms of safety in that type of situation they are undoubtedly good but for driving they make the car feel woolly and doing over the 70 limit if any of us ever did that, so just hypothetically, they would make the car difficult to place accurately. But she loves the car and has no issues with the run flats so it's probably a matter of adjusting to them.
But on my PS4's I had a flat on the M25 the other day. The tyre pressure warning came on and I drove around 5 miles to the next services and got a call out tyre guy to stick some budget tyre on until I could get home after the weekend and order another PS4. So not too much hassle without run flats and there is also the can of gunge in the boot to keep you going further.
Not mercedes ones , found these https://www.blackcircles.com/catalogue/michelin/pilot-sport-4/225/40/R18/Y/92/m?tyre=34513586 But not Merc marked, some i'm told ??No PS4? You sure they didn’t mean PS4S as they only come in 19” and up.
Ah! you don’t need MO or MOE marked tyres.
Allegedly they will have certain tread patterns or wear compounds dictated by the car manufacturer to suit the car.
If you absolutely must get MO marked tyres then there will probably be PS3’s somewhere as that’s what mine has on.
The only thing you need to match are the sizes, speed rating and load rating.
If you can get tyres cheaper with a higher speed rating or load rating then you could get those, but 1) it’s unlikely they will be cheaper and 2) they will probably have harder sidewalls and so be noisier/harsher.
My advice just get the ones that have exactly the same size and rating as your current ones. PS4 is what everyone is raving about in reviews and what I will get.