Normal oil temps?

[jdmboy]

I assume optimal oil temp range for 40wt oil in sporty cars is 90-100C. Is this corect?

 

[TR3-2001SE]

I believe you are right on from discussions on this site and people with temp gauges.

 

[jdmboy]

So then 80-90 is considered extreme condition?

Seems odd that most thermostatic oil products(thermostatic ****ches and oil diverters etc...) have 80C functions to open oil to coolers etc...

That seems to cold to me. Probably more to it though.

 

[Doug Hillary]

Hi,
all engines will vary but a good indictation of where engine builders aim is as follows;

Porsche 32vDOHC V8 (Coolant cooled)

Oil intercooler thermostat opens at 87C and is believed fully open at 93C
Measurements (over two years) at an ambient range of -3C to 43C and always after a minimum of 30mins engine time provided this;

Average - 77C (in sump 85C +/-3C)
High - 90C (in sump below 93C +/-3C)
Median - 77C (in sump 85C +/-3C)
There was a 3C variance between a 15w-50 and 5w-40 synthetics with the 5w-40 running hottest

Detroit Diesel(DD) 24v SOHC 12.7 litre 500hp

Engine ECM programmed to issue an oil temp warning @115C and to power down (progressive shut off) @121C using a 15w-40 mineral HDEO.
Measurements taken in an ambient range of -5C to 46C and always after a minimum of 120mins engine time (and using Delvac 1 5w-40) provided this;

Average - 103C
High - 112C
Low - 95C

The DD oil shut down temp corresponds with Porsche's two staged ECM warning programme @ 118C and 120C

I like synthetic oils to operate in the 90-110C range for maximum durability and performance

I hope this is of interest

Regards
Doug

 

[Gary Allan]

Most aftermarket thermostats open @ 180F ...Permacool, Mocol, etc.

Anywhere 212 +/- 20F is apparently considered acceptable for continuous temp. My oil temp appears to run around 160F in cooler weather. We'll see what summer brings.

 

[MGBV8]

A track car will have oil prewarmed to 90c to 115c expected race temp and up to 150c for qualifying.