I notice that my 1989 300E gets warm very quickly. In about a half
mile the temp gauge is already passed 40 but it does stabilize around
80 or alittle above that. Is that normal?   Can I get a thermastat
that opens at a lower temp so it runs cooler.  I’m not familiar with
import cars but I know that heat kills an engine. Would running the
300E cooler be wise?
The coolant is blue, can I used green antifreeze with it?  Whats the
difference between blue and green antifreeze?