AllenChicago

Greetings All!

I started driving a 2024 GLC300 SUV in mid-April. It's at the dealer now, getting checked out due to some "minor" annoyances. While it's there, I'm driving a 2024 GLC300 loaner. The loaner accelerates "easier" when the light turns green and rolls better with less engine effort. But it's more jarring when hitting larger bumps in the road.

I looked at the tire pressure, and all four Michelins are set to 41psi on the loaner car. On my car, I keep them at 37psi, because that's what's printed on my fuel door. On my wife's 2022 GLE350, we keep them at 31psi, because that's what her fuel door says is the correct pressure.

The 41psi on this 2024 GLC300 Loaner makes the car seem more powerful and responsive. But I'm afraid if I hit a big pothole on a Chicago freeway like I did last week, the tire would deflate. At 37psi, it was an alarming jolt.

Question: WHAT AIR PRESSURE do you keep your four tires inflated to on your 2023 or 2024 GLC300 SUV... and if it's not the "recommended" pressure, WHY are you using higher or lower?

Thanks in advance for taking the time to answer my question.

Allen in Chicagoland

Joey Mugo

When we received the vehicle from the dealership, the tyre pressures were 41PSI at the front and 45PSI at the rear. Way too high.

I have them set at 37PSI, as per the manual, and the drive is much nicer!

achez

Same as Joey, mine came with pressure in the 40’s. I keep mine at 37PSI on all 4. Does great!

AllenChicago

Thank-you! Now that I've had 4 days with this 2024 GLC300 "loaner" and its 41psi inflation, it will be easy to decide what to do when my car is returned, if the dealer (hopefully) leaves those tires at 37psi, like there were when I dropped it off.

AllenChicago

Thankyou for taking the time to reply. The pressure shown in our fuel-filler doors (37psi) seems to be what most forum members prefer.

Maybe there's a way to get the best of both worlds... the effortless accelerations, coasting, 90mph, that comes with 41psi, and the "cushioned/relaxed" ride that comes with 37psi.

EWL5

I have my GLS tires filled above 40 psi but that's only because we normally have a full cabin with even the 3rd row occupied. I think normal in the mid-30s is probably the best for most folks.

Elvisfan0108

My name is Allen and I’m in suburban Illinois.

Gitzer

Information about a GLS has little relevance in a GLC forum.

3.5L

I’m running it they way the dealer delivered it to me; all 4 tires at 40 PSI. This might improve MPG a hair as I’m consistently getting 33 to 37 MPG highway,
including a small amount of City on both ends of each trip.

6G Schnell

All my cars are set slightly above the recommended pressure, because of potholes. GLC 300 is set to 38 front and 39 rear for up to two people in the car.