George Murphy presents MB latest move into extended interval/lifetime services with an interesting coolant article. It appears that most MB produced since 2003 will qualify for the new 15 year, 150,000 mile coolant lifetime. Controlling Ph appears to be the central feature of this program. Not acidic,as someone recently tried to expound on, but slightly above neutral, approaching PH of 8. This because of a time release from an additive package found in new and replacement coolant surge tanks. From what I read, the current MB coolant, as well as Zerex G-05, will remain the coolant of choice. This will certainly be interesting to watch, following the recent policy change on the "lifetime fluid" used in there automatic transmissions. My 98 ML was delivered with this fluid, a sealed fill tube, and NO dipstick. Now the fluid life corresponds to the 39,000 mile service interval and a service dipstick is available. Worth reading, Jim Friesen Phoenix AZ 79 300SD, 264 K miles 98 ML 320, 152 K miles
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