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oil temp has to go above 100C to boil off water contamination in the crankcase. Condensation happens when the engine cools down and it's a byproduct of compbustion. If the oil can't heat up and boil off the water, it will damage your engine. That's why oil coolers can be dangerous and getting the wrong thermostat is too. Just as bad, is not driving your car and getting it heated up every now and again. Grandmother cars tend to have engines that go to shit at very low mileage, contrary to common wisdom.
So yes, you are not doing your engine any favors and you have to fix it. Go back to the OEM thermostat. If you track the car, get an oil cooler but use one that can be shunted for normal everyday use.
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