jester1

My 2017 GLE 43 has two spots on the car where recommended tire pressures are posted.

The on at the drivers door says cold psi should be 44 in the front & 47 in the rear tires.

But the one inside the gas filler area says the recommended psi is 31 for the front & rear.

That's quite a difference.

cadman_ks

Mine came on this last weekend warning me they were under pressure. They came on at 37PSI, which is neither as well...

jester1

I pushed the button near the mirror in the car to call customer service.

They said the sticker you see when you open the driver's door is the tire manufactures recommendation.

The sticker at the fuel-filler door is the one Mercedes recommends (31 front & rear).

You'd think with that big of a difference,Mercedes would have made it clearer.

BTW

They said go by the tire manufacturer's psi rec for the spare.

Go figure.

cadman_ks

Then why does the TPI come on at 37 PSI???

That makes no sense...

F18BEN

The TPI alert can come on at any pressure. You set that alert yourself. It was originally set at the factory. After you set it at the pressure that's in your tires, if the pressure drops a few pounds it alerts you. I put 37 pounds in all around and reset the alert from that setting.

cadman_ks

I see. I did not know that.

Thanks for the tip. I'll check into that...

jester1

Only the Lords of Mercedes are meant to know that.

Blessed be their name.

cadman_ks

LOL!!

I'm going to have to look up how to do this because it is not intuitive. I couldn't figure it out from the screens...

cadman_ks

I did finally figure this out. One thing that I don't like about TPI in general is that they take a long time to respond on the dash. I finally got all of the tires set to the same pressure, and then I reset it to the value that I wanted.

I kind of split the difference, and I'm running 40PSI as my base. The higher that pressure goes, the stiffer the ride is going to get...

fabbrisd1

yes - the driver's door jamb are pressure to be set at the factory - which are higher - to help prevent flat spotting during transport.

Yes - fuel filler door are the correct MB consumer suggested pressures

Yes - your TPMS system can be reset to set current pressure as baseline for the alert system.

Yes - the higher the pressure _ the "harder the feel - and also in general terms can extend tire life a bit.

Best practice - set at fuel filler door pressure - and 2 weeks take all tires "up 2psi" - drive that for a week/10-days - and then go up another 2lbs - until you have "dialed in your sweetspot"