Can You Use S Gear on the Highway?

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You can use S gear on the highway, but it is not recommended for prolonged use. Here are the specific reasons: 1. Transmission Wear: S gear only delays upshifting without altering other operational aspects, which inevitably increases the transmission load in the short term, raises temperature, and accelerates wear. 2. Reduced Comfort: S gear is the car's sport mode, and in this mode, the vehicle's comfort is slightly compromised, so it's best to avoid prolonged use of S gear. For cars frequently driven in congested urban areas, engine carbon buildup can be significant. Therefore, occasional use of S gear is beneficial for removing carbon deposits, improving fuel economy, and extending engine life.