BenzWorld Senior Member
Date registered: Dec 2009
Vehicle: 1997 E300D
Location: Newport News , VA
Mentioned: 0 Post(s)
Quoted: 17 Post(s)
The pressure that Mercedes recommends is their idea of the best compromise between smooth ride, short stopping distance, responsive handling, and reasonable tire wear. since the tire is a spring and raising pressure increases it's spring rate, raising pressure significantly can negate the design work Mercedes put into the suspension tuning. There is no question that adding 5 pounds or more to the recommended pressure will significantly decrease the tire wear, but you will decrease safety due to longer stopping distance, and poorer handling. You will also increase suspension wear due to more bouncing of the high pressure tires.
Since tire pressure (cold) always declines over time, and since I do not check pressure as often as I should, I occasionally find I have lost 4 or 5 pounds. I will add a pound or two above the recommended pressure when I check the pressure, knowing that I will likely approach or pass through the recommended pressure over time. In the case of my truck, I will add 5 pounds to the rears temporarily if I am going to pull a heavy trailer as it reduces the tendency for the trailer to sway.
If you have a number of tire pressure gauges, try them all on a given tire and you will likely find that they can disagree by as much as a few pounds. Makes it hard to know which one is correct.