As far as reaching and maintaining higher temps, the first thing that pops to mind is the outside of the radiator getting covered/packed with dirt/bugs/pebbles, etc and the fins on the radiator getting bent, all of which reduces the efficency of the radiator. Also the "scaling" internally (crud inside the radiator plugging up the core tubes, kind of like the pleasant things you hear about that plug up human arteries).
With the engine itself, I can't really think of much that would be related to aging or wear that would make the engine actually "produce" more heat, but you now have one lead here that has heard of waterpump problems om a newer 606 engine.
Could maybe be the thermostat. But if you think about it, WHAT could the thermostat "do" that would cause a rapid warm-up? MB would probably like to know, because the emission people just LOVE it when the engine warms up faster (better emissions).
If the thermostat opens early, the engine warms up slower, but eventually can overheat the engine (coolant not allowed enough time to transfer heat to the airstream in the radiator).
If it doesn't open "at all", you'd know that, it'd overheat.
But what if the thermostat opens a little later than expected? Too me, it would just mean the engine temp would be higher, but I can't reason in my head why this happening would neccessarily make the engine warm up "faster", it should only go "higher" than normal, but at a fairly normal rate.
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Geez Gilly, I didn't mean to beat up on you.
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I'll let it go THIS time
Gilly