Hi Steve,
I have been told the reason they vary in temp between 80 and 100 deg (and this is on the Aero) is that in summer it runs at 80 and winter its 100 and this is for the engine management - or something like that!
T

15 Weissman GT5
11 Aero8 SS
21 Q7
23 RR
24 Def'r 130
1960 XK150 DHC
1970 E-type
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