SL/R129: Friend with sl600 r129?
My generation of the M120 runs about 90-95 C. I have had it overheat at 7-12K feet in slow moving traffic on hot summer days in CO. My recollection is that the thermostatic valve can be changed out, but have not done so for my driving area. In other engines I often use the 95 C. because the engine has its best operation.


