In 2020 I replaced my 13 year old Mercedes S Class for a 2 year one with a premium pack. On my last one I replaced the Continental Tyres with what I thought were identical new ones but noticed they were much noisier. At a service I mentioned this to the technician and he looked at the tyres and immediately diagnosed the problem - the tyres fitted were Extra Load which he said were really only for very heavy vehicles, vans etc. As soon as I replaced them with non XL tyres I noticed a difference. The drive was much quieter. On my new S Class which I bought with 6,000 miles on the clock, I looked at the tyres and saw these were XL which because of the low mileage I am assuming they were fitted from new. The road noise is louder than my last S Class. Can I use non XL replacements or is it advisable to stick with XL because of the car's spec?