IMO the oil sloshing around in the air cooled engine pan should run from 212F to 250F, but can still lubricate at well above that, say out to 320F. The additives start disappearing at the high temps, and around 390F oil will vaporize and ignite (flash). The term "breakdown" is undefined, but may be viscosity reduction or loss of additives. This forum is full of oil talk, and may be everyone's favorite topic. So it's time to retreat into this thread which is " how hot is the oil?"
Pictured below is the $3 "K" thermocouple probe which can be inserted into the oil dipstick tube for temperature readings. This does not replace the dipstick. It uses the K wires to transmit the temp to your hand held digital thermometer. Cost: K wire $.25/ft and K connector $2.50. The K thermocouple is very accurate unlike the "typical" oil temp (fluid) sensor and gauge.
Pictured below is the $3 "K" thermocouple probe which can be inserted into the oil dipstick tube for temperature readings. This does not replace the dipstick. It uses the K wires to transmit the temp to your hand held digital thermometer. Cost: K wire $.25/ft and K connector $2.50. The K thermocouple is very accurate unlike the "typical" oil temp (fluid) sensor and gauge.
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