This morning (35*f) I noticed a louder version of a noise I had been hearing off and on for the last several days. Basically sounds like the engine is louder (this is the 98 E300 turbodiesel). The sound gets louder and quieter as I go over dips or high spots in the road. Louder on the downward dips, quieter on the upward ones. Also louder at higher RPM's. What is also puzzling me is it went away or at least got quieter as the car warmed. Would a bad mount be temperature dependent? I have not been under the car to measure, or is my mount theory way off base? No problems with the way the car starts, idles or runs. Thanks in advance for the help.

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K