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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 06-25-2012, 10:33 PM   #1
drewtbarrett
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Oil temp high!?

Recently my oil temp has been reading well over 210 in my m3 and it also says the out side temp is -40 degrees when is around 96 out. I'm guessing the problem is the oil temp sensor? Any ideas on what it is before I start buying stuff to do it my self? Thanks
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Old 06-29-2012, 09:00 AM   #2
TerraPhantm
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Recently my oil temp has been reading well over 210 in my m3 and it also says the out side temp is -40 degrees when is around 96 out. I'm guessing the problem is the oil temp sensor? Any ideas on what it is before I start buying stuff to do it my self? Thanks
Your outside air temperature is obviously gone. I think your oil temp sensor is fine. In these warm days mine is running pretty hot too. If it's less than 90 degrees, my oil temp will be around 190 or so (and about 170 on a particularly cold day), but yesterday it was at about 220 (ambient was 100 according to the car)
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Old 06-29-2012, 04:29 PM   #3
drewtbarrett
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Ya I figured it out an I have a new one on the way. Apparently my fender liner was cracked on the bottom and finally got ripped out and shredded the wire to the temp sensor.
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Old 06-30-2012, 04:10 PM   #4
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Optimal Oil temp for S54 is 240F . Safe zone is about 255-260F and anything more then that is danger zone.

Just because 210F is in the middle of your oil temp gauge , doesnt mean its the allowable temp.

Preferred oil temp for S54 is 240F
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Old 06-30-2012, 05:22 PM   #5
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Incorrect. S54 is designed to run at 210. I have never seen any s54 get to 240 under normal driving conditions. It can go to 265 safely, but that's not the optimal. It should not get that hot except on a warm day at the track.

N54 otoh is designed to run that hot.
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Old 06-30-2012, 06:21 PM   #6
Steven747
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someone link me to a m54 oil cooler .. I'm interested just for the hell of it. i would hate to have my oil temp go past optimal at any time
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Old 06-30-2012, 11:35 PM   #7
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Incorrect. S54 is designed to run at 210. I have never seen any s54 get to 240 under normal driving conditions. It can go to 265 safely, but that's not the optimal. It should not get that hot except on a warm day at the track.

N54 otoh is designed to run that hot.
What are normal driving conditions ? who justifies normal ? All I know is that the perfect or the optimal oil temp for S54 is right around 240F . Anything between 190 and 220 is still fine and the car will perform just as good and anything south of 255 is no good.

If normal driving conditions is driving to work 10 miles a day then sure, your car wont go over 200-210 .But who justifies normal driving to what normal is ?
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Old 07-01-2012, 05:54 AM   #8
TerraPhantm
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What are normal driving conditions ? who justifies normal ? All I know is that the perfect or the optimal oil temp for S54 is right around 240F . Anything between 190 and 220 is still fine and the car will perform just as good and anything south of 255 is no good.

If normal driving conditions is driving to work 10 miles a day then sure, your car wont go over 200-210 .But who justifies normal driving to what normal is ?
Normal circumstances being street driving. Find me a single piece of documentation that the s54 is designed to run at 240, and I'll believe it. Until then, I'll go with the temperatures they actually run. It's extremely difficult to get the car to 240, let alone keep it there. Only way I could get mine to creep that high on the street is if I do a top speed run (which is obviously not legal) or if I am driving a hill climb route and keeping the engine at 6k+ with lots of throttle. But as soon as you let off the throttle, the temperature starts falling towards 210ish pretty quickly

The only time my oil temperature has gone past 210 while driving responsibly was during days where the ambient temperature is 95F or higher. Even then, it's sitting at 215-220
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