John Galban wrote:

212F sounds a bit low. While that is the boiling point of water,
most of the Lycs I've flown behind have a max oil temp of around 240F.

The O-320 series limit varies, depending on the OAT. The max is 245 degrees at
average temperatures above 30 degrees but is as low as 210 degrees with average
OAT below 10 degrees.

George Patterson
Some people think they hear a call to the priesthood when what they really
hear is a tiny voice whispering "It's indoor work with no heavy lifting".