Dan, in the long run a cooler running engine lasts longer. Mine runs about 70 degrees for both
oil & water at cruise in non-hot weather but still rises to 80 degrees locally. In the summer add 10 degrees to both cases. On the track or driving hard uphill my numbers rise to 100 water and 110
oil. Be careful what you wish for. My motor is older (1972) but I have 61K miles on it, change the
oil every 3K miles and it still runs great. When my engine gets too warm it doesn't want to start (vapor lock.) That's why I always open my hood when I stop.
AZ Bob