The oil is changed on the recommended intervals (10 000 km) or shorter
allays together with the oil filter. I am using fully synthetic 0W40 over
the last 60 000 km.  The last oil and filter change was 2000 km ago.
So, I could not agree with you.
However, thank you for your opinion.

Dimi

The noise level do not increase with the increasing rpm, just the frequency
increase but only up to 900-1000 rpm. At higher rpm the engine sounds
absolutely normal.
The rattling noise is permanent at idle rpm, regardless the temperature of
engine and the ambient temperature.
I do not see an excessive shaking of the engine.

Dimi

I had a similar problem on my 300E.  It was caused by a worn out bushing at
the top of the belt damper.

The damper looks like a small shock absorber, and only of the top of it is
visible unless you stick your head in there and look closely.  In my case.
the top of the damper was visibly loose and rattling/knocking... mostly when
I put it in gear at an idle.

oh dear - a careless mechanic. mention it too the mechanic and try to make a
joke of it and ask for a free oilchange

cannot be brought about.
 
  212. Would society EVENTUALLY develop again toward an
  industrial-technological form? Maybe, but there is no use in worrying
  about it, since we can't predict or control events 500 or 1,000 years
  in the future. Those problems must be dealt with by the people who
  will live at that time.
 
 THE DANGER OF LEFTISM
 
 
 
  213. Because of their need for rebellion and for membership in a
  movement, leftists or persons of similar psychological type are often
  unattracted to a rebellious or activist movement whose goals and
  membership are not initially leftist. The resulting influx of leftish
  types can easily turn a non-leftist movement into a leftist one, so
  that leftist goals replace or distort the original goals of the
  movement.
 
  214. To avoid this, a movement that exalts nature and opposes
  technology must take a resolutely anti-leftist stance and must avoid
  all collaboration with leftists. Leftism is in the long run
  inconsistent with wild nature, with human freedom and with the
  elimination of modern technology. Leftism is collectivist; it seeks to
  bind together the entire world (both nature and the human race) into a
  unified whole. But this implies management of nature and of human life
  by organized society, and it requires advanced technology. You can't
  have a united world without rapid transportation and communication,
  you can't make all people love one another without sophisticated
  psychological techniques, you can't have a "planned society" without
  the necessary technological base. Above all, leftism is driven by the
  need for power, and the leftist seeks power on a collective basis,
  through identification with a mass movement or an organization.
  Leftism is unlikely ever to give up technology, because technology is
  too valuable a source of collect