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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Dec-16-2016, 11:34:34 PM   #1
AlpWhiteM3
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Default Another(ughhh) coolant temperature/MPG thread WINTER EDITION

Good morning/afternoon/evening!

I know... I know "USE THE SEARCH FUNCTION!"
I did.
But I noticed that there has yet to be an agreement reached in the community in regards to WINTER fuel economy and operating temperature! So here we are...
Car is a '04 Coupe with three pedals and 98k miles, meticulously maintained and in perfect condition. I'm in NC, unfortunately, and today was the first below-freezing day of the year. Temps around 25*F with some solid windchill.
Made a trip up to Winston Salem from Fayetteville, about a 120 mile drive one way and kept speeds from 75-90mph on CC. Of course this was done on the NC Autobanh. Uhhhh... yeah.
So anyways, noticed that my coolant temp hovered around the 75-79*C mark. Literally sitting on the first dot. Oil temp around 200*F. I got shockingly blow fuel economy at about 19MPG for the whole round trip and was pretty bummed. Highest temp I saw was 83 degrees and that was after violently railing on the M through the twisties, oil temps to 225*F.

Figured: "Okay, maybe it's time for a Thermostat." But after checking with BMW, the only tstat sold is 80*C!
That's it. That's all they've got. I figure my atrocious fuel economy is due to the S54 running rich as f*** to try to stay warm but I can't help but think this is an issue.

So what do you guys typically experience for winter fuel mileage and coolant temps? Let's get this answered OFFICIALLY! Picture is after having been on the highway for about two hours.
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Old Fri, Dec-16-2016, 11:35:32 PM   #2
AlpWhiteM3
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

Scratch the picture I guess... needles on the first dot ��
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Old Fri, Dec-16-2016, 11:45:34 PM   #3
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

In January 2015 I drove the M3 in -35 degrees F windchill to school 10 miles and back at 35mph; temp gauge never moved out of the blue, oil temps was all the way at the left, sounded like a big cam cold start for 30 seconds straight

this stock system with 105k overheats in vegas right at 103 degrees f
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Old Fri, Dec-16-2016, 11:59:44 PM   #4
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

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Originally Posted by cowboyM3 View Post
In January 2015 I drove the M3 in -35 degrees F windchill to school 10 miles and back at 35mph; temp gauge never moved out of the blue, oil temps was all the way at the left, sounded like a big cam cold start for 30 seconds straight

this stock system with 105k overheats in vegas right at 103 degrees f

LOL. That's honestly kind of surprising seeing as how cold Bavaria is. I mean it's not THAT cold though. I wouldn't even leave at -35* 😒
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Old Sat, Dec-17-2016, 05:21:12 AM   #5
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

I dont know man. 19mpg sounds good to me. Im at 14.5 ��, I can manage 16.5 if i baby it.
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Old Sat, Dec-17-2016, 12:18:46 PM   #6
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

OMG nooooo

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Old Sat, Dec-17-2016, 03:51:18 PM   #7
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

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Originally Posted by icecream View Post
I dont know man. 19mpg sounds good to me. Im at 14.5 ��, I can manage 16.5 if i baby it.
here i am thinking the same damn thing lmao
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Old Sat, Dec-17-2016, 10:45:56 PM   #8
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

Windchill isn't applicable to machines.
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Old Sun, Dec-18-2016, 05:17:39 AM   #9
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

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Windchill isn't applicable to machines.
True - but it can cause the temperature of the machine to drop to the actual air temperature quicker.
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Old Sun, Dec-18-2016, 04:20:44 PM   #10
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Default Re: Another(ughhh) coolant temperature/MPG thread WINTER EDITION

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Originally Posted by kater16 View Post
True - but it can cause the temperature of the machine to drop to the actual air temperature quicker.
Yes, however the previous posts insinuate the wind chill factor somehow played a role in engine temperature whether running or not. An engine never falls below actual temperature regardless of wind chill.

For example, if it's 36 degrees outside but the wind chill makes a human feel like it's 26 degrees, water never freezes and an engine (cold) never drops below 36 degrees, regardless of how strong the wind might be.
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Discussing Another(ughhh) coolant temperature/MPG thread WINTER EDITION in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)