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Old 11-06-2012, 09:24 AM   #1 (permalink)
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Date registered: Oct 2012
Vehicle: 2013 ML350 4MATIC
Location: Des Moines, Iowa
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Exclamation ML350 Tire Pressure (from MBUSA.COM)

Thank you for your email to Mercedes-Benz.

We recommend referring to the tire pressure chart located on the inside of your fuel filler flap and setting your tires at 32F/32R PSI. If you are unsure how to adjust the air in the tires, we recommend visiting your local authorized Mercedes-Benz dealership for help.

The opportunity to assist is appreciated.

Kind regards,

Mercedes-Benz USA, LLC

[THREAD ID:1-KGN5W]
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Old 11-06-2012, 04:17 PM   #2 (permalink)
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Tire pressure

Quote:
Originally Posted by foolesh View Post
Thank you for your email to Mercedes-Benz.

We recommend referring to the tire pressure chart located on the inside of your fuel filler flap and setting your tires at 32F/32R PSI. If you are unsure how to adjust the air in the tires, we recommend visiting your local authorized Mercedes-Benz dealership for help.

The opportunity to assist is appreciated.

Kind regards,

Mercedes-Benz USA, LLC
That's what I've been saying for a year. One on door jamb is way too high. The 32/32 needs to be adjusted upward per the chart if carrying or towing heavy loads.

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Greg Lake Oswego, Oregon, USA
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2012 ML350 BE - Arctic White/Black Premium Leather/Satin Ash
Packages: Premium 02, Lighting, Sport Interior, Dynamic Handling, Panorama Sunroof; Options: hitch; MBTex dash, black h/l, sport seats, pass thru
2008 M3 Coupe- Alpine White/CF roof/Fox Red (2015 M4 on pre-order)

Last edited by GregW / Oregon; 11-07-2012 at 07:43 AM.
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Old 11-06-2012, 04:56 PM   #3 (permalink)
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What is max PSI on the sidewalls of the tires?
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Old 11-06-2012, 07:35 PM   #4 (permalink)
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Inside the fuel filler door are the correct driving cold pressures - however to increase tread life, most owners would be well to try adjusting "up" in 2lb increments - each 2lb increment will also give a change in road feel and handling, best to stay at each "step" for a week or so to evaluate.

There are a good # of MB dealers who choose to preset to 38lb or 40lbs - in response to customer compaints on short tread life at factory correct settings.

There is some type of MB explanation on the door jamb figures - unfortunately I have yet to find anyone who knows what that ratioanle is - the door jamb # are really whacked.

Typical "max pressure" of OE tires depending on brand should be around 50psi.

Mercedes dealer service people strongly suspect that like ohter car manufacturers the tires provided to the factory - although correct spec and #'s for "normal" tires bought off the shelf same model - are actually shipped by the tire manufacturers to car manufacturers with softer tread compound - examples they cite is common 2nd tire set - same tire and markings - last close to 160%-180% more tread life in miles than 1st set.

Could be considered urban-auto-legend but long term services techs and service mgrs see it all the time.

Where do MB dealers buy tires ? Surprising # of car dealers often buy from Tire Rack, depending on brand/tire they might get a small additional discount, and/or reduced or free delivery - again depending on the brand/size of a particular tire set.
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Old 11-09-2012, 12:24 AM   #5 (permalink)
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Date registered: Jan 2012
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Quote:
Originally Posted by foolesh View Post
Thank you for your email to Mercedes-Benz.

We recommend referring to the tire pressure chart located on the inside of your fuel filler flap and setting your tires at 32F/32R PSI. If you are unsure how to adjust the air in the tires, we recommend visiting your local authorized Mercedes-Benz dealership for help.

The opportunity to assist is appreciated.

Kind regards,

Mercedes-Benz USA, LLC

[THREAD ID:1-KGN5W]
Thanks!
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Old 11-12-2012, 07:30 PM   #6 (permalink)
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Anyone know what the impact is to traction in rain and/or snow when running at higher than the factory recommended pressure?
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Old 11-12-2012, 08:37 PM   #7 (permalink)
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Tire pressure and wet traction

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Originally Posted by GoldFeather View Post
Anyone know what the impact is to traction in rain and/or snow when running at higher than the factory recommended pressure?
Tire Tech Information - Air Pressure vs. Wet Performance
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Old 11-13-2012, 08:32 AM   #8 (permalink)
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That is an excellent test demonstrating the performance in water.
Snow may be different. Thin snow may behave like water, so the higher pressure works well. But there will come a time when the tyre cannot channel the snow, so you have to get your traction from the snow.

In the extreme, if the snow is too deep to drive through, then you have to float on top. Flotation can only occur if you increase the ground contact area. This is done by dramatically reducing your pressure, so the sidewalls bag out and the footprint lengthens. Do it properly and you can drive over more than a metre of soft snow. Of course speed must be reduced, low range first only, and minimum power applied.

(It may sound strange for an Australian to inform Canadians, but we learnt this craft from the Icelanders.)
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