- Aug 9, 2013
- Toronto, Canada
Replaced the CSF Racing rad with a CSF oil cooler combo rad in my '11 STi sedan and although this will work brilliantly at the track I am concerned that the oil temps are too cold for street use. Car is stock with oil temp monitoring, AOS and this big rad with an integrated oil cooler. Objective is reliability at the track. Measured at the sandwich plate with an Auto Meter electric gauge, oil temps were 225F max with the CSF Racing rad at the track. This is good. The CSF oil cooler combo rad has a thermostat sandwich plate set at 75 - 82C +/- 2C. Converted to imperial this is 167 - 180F, which is basically coolant temps. Now highway temps are 167F in (13C ambient) and 180c in city driving, and I'm concerned that this is too cold for winter driving. It looks like the industry standard thermostat setting for external oil coolers is 185F but I'm learning that the target temp for oil in a street driven car should be between 215 and 240F. Should I be concerned about these oil temperatures for the winter in Canada?