Slight fluctuation of revs at motorway speeds

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clk208

MB Enthusiast
Joined
Feb 14, 2009
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1,276
Location
NW
Car
CLS
Petrol 3.5 engine with 722.9 7 speed gearbox, Dec 2007 build.

Noticed last night when on a gentle motorway run to pick up some friends from the airport that I have an issue with fluctuating rpm.

I was on cruise at 55mph as I was running a bit early and noticed the rpm was fluctuating by up and down by around 100rpm every few seconds on a flat surface. Upped the speed to 70mph and found the same was still happening.

I've read this can happen on the TDs if you have a split hose etc, can anyone speculate as to why this may be happening on my NA 3.5 petrol?
 
I've got this also
 

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