Engine high temperatures
 

I have a question regarding our car's high engine oil temperatures. Do you think it is connected with an overall high temperature in the engine? If yes, is there any improvement if someone installs a lower temp thermostat and not an oil cooler? I understand that eventually the engine temperatures will go high again, but maybe it could give an advantage in spiritual driving or running a few track laps.

If you watch the coolant and oil temps at track the coolant genraly stays close to the stock thermost temp arround 95C. But the oil temps continue to climb past 125C.

This appears to indicate the stock cooling system is adequate , but that an oil cooler would be a good idea.

Fitting a low temp thermostat may work to lower coolant temps only if the cooling system has suffient spare capacity to keep the coolant at the lower temp say 85C.

This is going to depend on ambient temps as well as you will have less differential between coolant temp and ambient temp reducing the ability of the cooling system to loose heat to the surrounding air.

It may keep the oil slightly cooler , but the oil will likey still rise to a substantially higher temp.

I think you would be far better investing in an oil cooler, than a low temp termostat for track use.

or light track use and a bit of spirited driving the forester cooler may be suffient

http://www.nedautoparts.com/products...oem-subaru-brz

It possible that the heat exchanger type cooler would benifit from the lower temp termostat assuming their is enough capacity in radiator as the temp differential between oil and coolant would increase allowing the oil to loose more heat to coolant

but the cost of the heat excanger cooler plus thermost plus coolant you could have almost fitted a radiator type oil cooler and actually increased overall cooling capacity