Pretty normal for all engines Doug. Even in the summer heat, the oiling system and it's limited cooling capability is secondary to that of the normal cooling system. It will be the last to show temprature, and only after the regular cooling system has begun to reach its BTU dispersal capacity.
Edit:
Although it is totally "Foreign" to our cars and their time period, a conventional water radiator with a separate section for the
oil to share some of the generated heat VS a separate
oil cooler could be utilized with very good results, although a separate inline
oil thermostat and air to air cooler seems to be the more popular (original) way of thinking (???)
Until (WE) begin to "Lean" on these cars (with your right foot) and generate horespower/heat, they generally have more than enough cooling capacity and the oil is slow to show any temprature.