Don't forget high oil temp followed by low oil pres, can be caused by several problems other than low oil level. It is often the first sign the engine has suffered a major internal mechanical failure. Certainly in large radials a sudden rise in oil temp preceeded the start of two "you know you are having a bad day when" flights for me
. This does not include the time we were climbing out of Billings Montana in the DC 6 and I noticed the No 4 oil cooler door was wide open while the No 3 was 3/4 closed. (the oil cooler doors move automatically to maintain a constant oil temp). Sure enough within a few mins the oil temp started to climb but we were light and the old Douglass tri motor got us uneventfully home.
As an aside I still consider the DC6 my favorite aircraft to fly. It is truely a gentlemans carriage
