The long-running Mercedes SL class grand tourer included the SL400, a late-2010s model featuring a 329 hp twin-turbo 3.0L V6. Bridgestone Potenza S001, Continental ContiSportContact 3, or Pirelli P Zero Nero All Season tires would be OEM for this make/model.
When it comes time to shop 2015 Mercedes-Benz SL400 tires, we think your best bet will be premium performance-oriented all-season tires like the Hankook Ventus S1 Noble2 (H452), Continental ExtremeContact DWS06 PLUS or Toyo Proxes Sport A/S. For more nimble handling, cornering, and braking performance, check out summer/ultra-high-performance tires like the Yokohama Advan Sport V105 or Lexani LXUHP-207. Just remember that summer/UHP tires use a softer tread compound that will stiffen up and lose traction on cold days. Summer/UHP tires shouldn’t be used for temperatures below 40-45 degrees F.