Plastic thermostat housing - W126

I have a 7/88 build 300SE with 166,000kms and recently had to have a new radiator fitted - a new Nissen brand (made in Denmark). What surprised me is that last week I again had dripping coolant on my driveway which I tracked
down to the original factory thermostat housing which was made of PLASTIC ! ??? I had a new genuine one fitted ..... but this time an alloy one - at only $AUS30. (one of the cheapest genuine parts I ever bought).
My questions: Does MB still fit plastic housings to their new vehicles? Is there any other "hidden nasties" that should be changed? ...... I count myself very lucky that I found and fixed the thermostat problem at home and before I cooked the engine .......I could have been greatly contributing to some country town economy if I lost my coolant out bush!!
John Bachmayer Adelaide, Australia.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Mercedes parts aren't expensive, if you get them from the correct place. (not a dealer)
I own a Mercedes and a domestic product, and find that the Mercedes parts are infact cheaper in some parts and very close with everything else and last longer - if comparable.
Hello from western Australia.

is
!
and
to
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.