I'm planning on changing the coolant in my M103 for its 90,000 mile service. I've got the service CD and a gallon of MB coolant (from here) but though I'd query this vast wealth of knowedge regarding any tips. For what its worth the car seems to be running a little hotter in this cooler weather, its been getting down into the 60's here in So Cal. I've only had the car a year and a half so I'm not completly familiar with its seasonel perks. Could it be its just keeping itself warm, or is it the old coolant?

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)