On my 420 on warmer days (only when the cars is cold), the car whistles for 2-3 minutes and the sound goes away for the day. Tech said nothing serious, just the air filter.
IS this something that I should be concerned and why does it not occur on my 300 or any other Benz? Should I just replace the air filter? Should be cheap, right? The noise is just annoying and on some days can be loud.
'89 420 SEL
'90 300 SEL
'84 300 SD (sold it)