mercedesbuff

I had winter tires installed at Costco yesterday. When they handed me the paperwork, I noticed that the TIRE PRESSURE was set to 41 / 44 PSI. Yikes!

According to the Mercedes recommended pressure (behind the fuel door), my "normal pressure" should be 31 / 31. So before leaving the parking lot, I had to let out 10-13 PSI from each tire!



So make sure to double check, if you're having Costco install tires...

kosta15auto

Check your driver's side doorjamb. Maybe the Costco technician knows what he is doing.
41/44 is what the official label on the doorjamb asks. Bring the issue to MB but not Costco. I believe they issued a bulletin for an incorrect label. You better follow your doorjamb moving forward.

mercedesbuff

This instructional graphic from M-B illustrates the tire pressure confusion. I'm following the guidelines found on the fuel door:
"...Customers should use the tire pressure found on the fuel filler door label."

jadatis

Searchd the car and tires.
Tires 113 V apear to be XL, SL is loadindex 109 in this sise.
So are allowed to carry 1150 kg/ 2535 lbs a tire, upto 160kmph/99mph, AT 42 psi.

American system P-tire At 41 psi, so no councidence 41 psi given for front, not calculated for the axleload and max technical carspeed.
Found the car to have GVWR of 3230kg/?? Lbs on Dutch site, so expect the GAWR's to be about FR 1615 kg and Rr 1780 kg.
In earlyer days they calculated recomended
​​​​​​pressure for GAWR's and max technical carspeed with no reserve .

So I will make you a list in wich you can look back your 99% acurate determined axleloads in your use ( succes with that, most tricky part) or GAWR.

​​​​​Then it gives max reserve at wich comfort and gripp still acceptable.
Will even give for gawr's in the 30ts psi.
Then advice to laws of nature, wich always rule above ideas of carmakers.

​​​​List can be used for every XL loadindex 113
So AT 42 psi, max to use speed 160kmph/99mph

Axleload/ cold psi/ Axleloadcapacity
974 kg/ 18 psi / 2148 lbs
1021 kg/ 19 psi / 2251 lbs
1067 kg/ 20 psi / 2353 lbs
1114 kg/ 21 psi / 2456 lbs
1160 kg/ 22 psi / 2558 lbs
1206 kg/ 23 psi / 2660 lbs
1253 kg/ 24 psi / 2762 lbs
1299 kg/ 25 psi / 2863 lbs
1344 kg/ 26 psi / 2964 lbs
1390 kg/ 27 psi / 3065 lbs
1436 kg/ 28 psi / 3166 lbs
1482 kg/ 29 psi / 3267 lbs
1527 kg/ 30 psi / 3368 lbs
1573 kg/ 31 psi / 3468 lbs
1618 kg/ 32 psi / 3568 lbs
1664 kg/ 33 psi / 3668 lbs
1709 kg/ 34 psi / 3768 lbs
1754 kg/ 35 psi / 3868 lbs
1800 kg/ 36 psi / 3968 lbs
1845 kg/ 37 psi / 4067 lbs
1890 kg/ 38 psi / 4166 lbs
1935 kg/ 39 psi / 4266 lbs
1980 kg/ 40 psi / 4365 lbs
2025 kg/ 41 psi / 4464 lbs
2070 kg/ 42 psi / 4563 lbs
2114 kg/ 43 psi / 4661 lbs
2159 kg/ 44 psi / 4760 lbs
2204 kg/ 45 psi / 4858 lbs
2248 kg/ 46 psi / 4957 lbs
2293 kg/ 47 psi / 5055 lbs
2337 kg/ 48 psi / 5153 lbs
2382 kg/ 49 psi / 5251 lbs
2426 kg/ 50 psi / 5349 lbs
2471 kg/ 51 psi / 5447 lbs


​

muadi

I always follow the door sticker and keep 41/44 in my GLS. The car was delivered with this pressure and I'm maintaining it at the same level.

darlop

Its standard procedure for techs to fill to the max level. Your Mercedes dealer will do the same. Its not going to hurt anything other than a harsher ride.

The normal value is on the fuel door.

chassis

And the max pressure is on the tire sidewall.

wildta

Discount Tire too. I think they all do it for liability reasons.