[Got the Bug]

Originally Posted by mark_n2

Understand for pwr, but oil needs to be kept at a minimum of 180F with 230F max (82C to 99C). Optimum range is 190 to 210F for engine life although 220F is considered normal for todays engines. I also agree that the two, oil and water, need to be as close as possible so oil termperature would be the determining factor. I have a Roush 427 small block that settles in nicely around 90 to 95C for both water and oil even on the hottest days.

I'm not sure what the purpose of the dot on the gauge is (maybe just a quick reference point), but your operating temps seem perfect. I normally block my oil cooler off during the winter and remove the block from April through the end of the fall.