oil temperature

Hi

Thanks - this thread has been helpful and highlighted a risk/concern.  I have a 912ULS with 45 hours accumulated over the past 9 months and 2 oil changes.  Climate is generally low humidity. Oil temp has always been around the 70C level.  I'm now concerned that over this period there is a risk of internal corrosion having taken place - any thoughts on the real risks and if so how to detect this?

Cheers

Andrew

For piece of mind, have the engine inspected by a Rotax agent. As this will come at some cost & inconvenience, I would just keep my fingers crossed, hope that there has been no damage & keep flying.

Focus on; finding a way to raise the oil temperature to a consistent 95C(+/- 5 degrees) in Cruise and over 100C in Climb-Out.

Bit of sheet aluminium, cut to fit, or air conditioners foil tape, or similar over your oil/coolant radiators, part blocking effective surface area, is a low cost, know to be effective method. Start with about 1/4 of the surface are covered - go fly, record temperatures (including OAT) decide to increase /reduce area covered.

Using sheet aluminium fabricate a partial cover over the exit air vent -  go fly, temperatures (including OAT) decide to increase /reduce area covered.Do this for summer & winter temperatures. Bit more time involved but will reduce future guess work - just use the appropriate vent cover for the season.

Purchase an oil thermostat. This is the high cost, complexity , weight increase, solution that works for many flying in low temperature environments.😈

Thanks Sean will give those a go

Thanks for all the input.  Through experimentation I have worked out the tape on the oil cooler to where I can keep my oil temps in the 190-220 range with ambient temps up to about 40F OAT.

CHT temps have been fairly consistent from warm to cold weather so no coolant radiator blocking applied.

"CHT temps have been fairly consistent from warm to cold weather so no coolant radiator blocking applied."

Consistently war/cold?

Your coolant/CHT temperature goal should be to have similar temperature to your oil ie mid 90C

It is not unusual to have some compromise - my oil temperatures are almost perfect,  95-97C in Cruise  & 105C in Climb.

My Coolant/CHT is 89C. I have found that even a minimal increase in radiator blocking, causes the temperature to rise to 100C + in Cruise - I will have to live with what I have for now.😈