I have a temperature sensor inserted in the fill plug of my 5MT and wanted to share some data from my last track day at Watkins Glen race track. After a 20 minute session of hot laps the ending oil temperature was 280 degrees and the ambient temps were only in the high 60's! At those temperatures the oil is definitely going to break down and not provide the kind of lubrication needed for the transmission.

Normally I run a transmission cooler but I turned off the pump for this one session to see how hot the trans oil gets. I thought maybe I did not need the cooler as I normally do not see temps over 180 degrees with the cooler on. I guess its doing its job

Just thought I would share for those not monitoring transmission oil temps and not running a cooler.

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