I've been keeping my 87 pretty well maintained, keeping up with repairs and maintenence. Since it only has 132K on it and runs perfectly and looks like new naturally I want it to last for another 130 or more. From what I've read it seems like the weak link on these 603 engines is the head, if it ever overheats. For this reason I am going to put in a new OEM thermostat and new OEM hoses. The radiator was replaced by MB at 90K. I see this as cheap insurance against a possible engine failure due to being overheated, especially if my wife is driving it on one of her frequent highway trips between Phoenix and Tucson in temperatures over 100 degrees with the A/C crankin. Any other suggestions? Has anyone tried the water wetter product? Is the MB coolant really better?
Thanks, Brian

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Brian
87 300Dturbo 180K #14 head still running R-12 SOLD 12/2017
02 F350 Powerstroke 180K
05 Chevy Express 1 ton w/Royal Utility box 120K
08 Infiniti FX-35 40K
15 Golf Sportwagen TDI 35K
10 Sprinter 3500 chassis with a Class A Winnebago on it. 56K