It has been running a tad on the hot side ... tends to approach 100 on warm days during my somewhat trafficy commute to work. It isn't "overheating" or doing anything particularly alarming, but the frequency with which it would creep to 100 was a little concerning to me, so I spoke to my very trusted mechanic (in addition to the, as always, helpful advice I got here). As usual, he didn't try to cram unnecessary work down my throat, but did recommend changing the t-stat. He said it wasn't likely the cause (that more likely, the running temps are just a reaction of the hilly area + lots of stop lights), but that since I brought it up, it would be a good idea to replace the t-stat regardless. I looked back over the records and it's still the original unit in there as far as I can see. So for $25, if I can do that myself, I figured it wouldn't hurt as preventative maintenance.
Interestingly, since I purchased the t-stat, it's been running much cooler ... even though it's sitting on the floor of my living room ... 
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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)
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