That's easy. Once you make sure that your oil temp probe is accurate,
just block part of the airflow over the oil cooler with duct tape.
Experiment the amount of the coverage you need to get it to 180F.

I do this all the time in winter.


nrp wrote:

Another symptom of persistently low oil temperature is an engine with
little blowby - a good thing, although 180 degF still remains the
operational goal. My 172M is cold blooded & I wish there was a way to
get it to warm up more consistently.