Changing coolant yearly or lack thereof.

[Williy]

I forget which one it was but it says lifetime on
the container. If using it would check to see if
its up to par to keep from freezing
I change hoses and anti-freeze every 5 years
never had any problems.

willy

 

[RalphVa]

Hoses on our 1983 240D Benz were still original at 26 years.