R35o Road noise

Asked by Jul 05, 2013 at 03:31 PM about the 2008 Mercedes-Benz R-Class R350 4MATIC

Question type: Maintenance & Repair

I drive a Mercedes 350R Class.  Lately the highway noise has been very loud.  The noise is more of a loud hum that anything.  No squeaking or grinding of any kind.  Usually happens once I accelerate over 30 mph.

4 Answers

I'm thinking that you car has around 80,000 miles on it...suspect if a 4wd model, the CV axle boots have leaked their grease and are starting the familiar helicopter sound that happens when no grease if left~...this is for 4wd models only...doesn't apply to RWD vehicles~

2 out of 2 people think this is helpful.

easy enough to shimmy under there with a mechanic's creeper or sheet of cardboard equipped with a dull large phillips screwdriver and poke at the boots to see if any cracking or leakage of grease has occurred~

1 out of 1 people think this is helpful.
105

could be tire noise....

1 out of 1 people think this is helpful.

You would not find leaking molybdenum disuphide grease, if it were just tire noise~

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