In the "for what it's worth" department: I echo Neil's comments re: oil cooler. 
 I installed one on Hobbs (77 Spit 1500) and even during the 110+ degree (F) 
summer temps he still drives at just below 1/2 on the guage.  of course, it 
rolls right up toward redline again when stuck in traffic, which is why I also 
have a pusher fan as a jussincase.
Scott
77 Spit "Hobbs"
75 Spit "Rufio"
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