zwy_ok

Hi, what's the recommended tire pressure? On my way home from the dealership with my new ML350, the tire pressure warning light's up, saying the current tire pressure is 38psi. But it didn't say the recommended tire pressure. Checked the label beside the door, it only says the tire pressure for full load, 45psi for front and 48 for rear. This sounds too high. Then found another label in gas filler cap, which says 32 psi for both front and rear. Wrote to MB and dealer, both got ignored. So where can I find the recommended tire pressure? Thanks a lot.

redcoupe

35psi and reset TPC

GregW / Oregon

It really says 45/48? That is much too high. I don't have this vehicle yet, but it should be 32-35 front and 32-39 rear. Rear will vary more depending on loading. Can you post photos of the two labels?

zwy_ok

Yes, both the two labels only wrote 45/48 for full load, it didn't write anything for normal load, and it didn't emphasize 45/48 is for full load. So previously I thought it's for normal load (even though I was afraid it's too high), and inflate the tires to 45/48. The warning light did go out after that. Then I found it's too bumpy on the road and I am afraid of the high tire pressure. So I deflate it to 38. Lucky the warning light didn't come back anymore. I am surprised a luxury manufacturer as MB would miss the normal tire pressure information on the label. It did have another label inside the gas filler flap. But its user manual recommend people to look at the label beside the door. I am a little disappointed with MB, get even more disappointed when MB didn't reply my email.

GregW / Oregon

Did you email via Owners Online? That usually gets fairly quick response.

redcoupe

Update:
Today I went through 4 new ML 350 and found that the all the set pressures in the TPC control unit's were at 48psi-50psi. I corrected this by re-programming the control unit's, setting the pressure to 37-38psi and then test driving them.

GregW / Oregon

Can you notify MBUSA about this?

dgiturbo

I usually go with the pressures in the fuel filler lid. That has worked fine for me for several MB's. And yes, reset the TPMS.

hiend

Please explain how to reset TPMS, thank you. ML 350, 2011

GreginNH

Fuel filler lid sticker is wrong. The tires for 2012 require tire pressure as designated on door pillar. I brought this to the attention of my dealer and they contacted MBUSA to confirm.

GregW / Oregon

Don't you have a manual?

hiend

I HAVE EVER QUOTED you?

zwy_ok

But if we stick to the tire pressure on the door pillar, the ride feels quite bumpy. Also, I noticed the max allowed tire pressure printed on the tire is around 53 psi. That concerned me if the code tire is inflated to 45/48 psi, thinking that pressure will increase after you run a while on highway.

GregW / Oregon

If memory serves me right, my W164 with 19" tires takes 32F/35R with low load and 32/39 loaded. No reason the W166 should be much different. The maximum tire pressure is a cold rating, not taking into account the increase while running.

GregW / Oregon

Not sure what you're trying to say, but here is the relevant page:

hiend

Thank you, same instruction for ML 2011?

GregW / Oregon

Sorry, Page 333 here: http://www.mbusa.com/vcm/MB/DigitalA...al/2011_ml.pdf

wheels777

https://mbworld.org/forums/attachmen...ers-manual.pdf


This page refers to:

B-pillar on the driver's side or the tire

pressure table on the inside of the fuel filler
flap to ensure the tire pressure in all four
tires is set correctly for the current operating conditions."

Dealer says Pillar Post. What gives. Which is it?

GregW / Oregon

They should be the consistent. This is from my 2006 with 19s:

B pillar: 32 F / 39 R
Filler cap: Partially loaded 32 F / 32 R; Fully-loaded 32 F / 39 R

Add ~4 lb for warm tires.

I would be willing to bet the correct values for the 2012 are virtually identical to these.

wheels777

Thanks Greg, Always helpful.

Mine was delivered to me with about 35lbs when it was 70 degrees. A week or so later as the temp dropped outside the Tire pressure warning came on. Drove tot the dealer and they went by the B Pillar Post. So their prep dept. and Service Advisor are not on the same page. It's my guess that if I called MB and spoke to 2 different reps that they would not know which was correct.

Ya have to admit this a bit absurd due to the wide variation from the labels.

I think I'll check with the tire manufacturer , Continental.

I notice when they have the higher pressures the tires just about "Ping" going over some bumps.

calemonlaw

On newer cars, the recommended pressure is most commonly listed on a sticker inside the driver’s door. If there’s no sticker on the door, you can usually find the specs in the owner’s manual. Most passenger cars will recommend 32 to 35 psi in the tires when they’re cold.

GreginNH

So I called MB headquaters myself since I was having doubts as to the credibility of "service advisor". Apparently, the B Pillar ratings are for Maximum Load (even though it is not clearly stated) and that it is perfectly safe to run the tires at the lower range as referenced on the fuel door.

MBNA109

What did the fuel filler door say?

GregW / Oregon

Post #4.

MBNA109

Greg in my GLK, I went through this also - I have 2 labels in the door jams. I was thinking the OP was not clear in what he was looking at & his tone in the below quote he implies THREE labels & he was only looking @ the door jams.