Engine oil temps and relation to ambient temps

[rushign23]

After going to a couple DE's with my Z, I've hit almost 290
degree oil temps in only 70 degree ambient air temps.
I started holding a higher gear through one of the corners,
and it seemed to keep it a bit lower. I'm curious if anyone
thinks/knows if there is direct relationship between oil temps
and ambient temps--when it is 20-25 degrees warmer in
the middle of summer, will my top oil temps be 290+20,
or 310 ?!?! Yeah, I know that an oil cooler is calling my name, just
a bit concerned until I actually do pick one up--in the meantime
I'm changing the oil after every event. Thanks.

[No Doubt]

Although the oil temperature may be slightly higher it won't be in direct proportion to the ambient temp. Changing the oil after every event is a good idea but if you're seeing temps that high, which is common as you found out, an engine oil cooler is a good idea.

Even changing the oil after each event, although prudent, does nothing for the cumulative effects such high temps can have.