195° F, 10w30 mineral engine oil and 50/50 glykol/water, just what the service manual calls for. Not an issue in 25+ years.
Note: Too low engine operating temperature increases wear and looses power.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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