Hi Pat. I developed the first oil therm ( using Thermostassis ), and it has been great. It cuts down warmup time by a bunch. I can start engine, and start taxiing right away, and be at needed temp before I get to end of runway. ( over 1/2 mile for me ). I would rate this as my second best invention. The "Heater Damper Door" is best/first for winter flying.
Flying RV-12 - Serial #120036
Paid in May ( 5-2019 )