SL/R231: Coolant Flush for R231 ?


I can't find anywhere in recommended service.
BTW: I also have a 2020 E class and nothing on the maintenance chart Re coolant their either
BUT
My 1986 R107 (560SL) states coolant s/b changed every 3 yrs !
What's up???
SO today they realize longer service life of these fluids.
In 1986 3000 mile oil change was all the rage.... today 10K






