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  #1  
Old 04-26-2002, 03:03 AM
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Is Cooler Better

Is running the car a bit cooler than normal temp better or is it not good for it?

I am talking 80C is the norm and 65C to 75C is what it runs at.

What are the pros. and cons? If any.

Thanks
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  #2  
Old 04-26-2002, 07:37 AM
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Thats way too low. Are you sure your temperature gauge is right?Engine wear increases significantly at temperatures 75 C and lower. I would suggest that you change your thermostat.
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  #3  
Old 04-26-2002, 08:52 AM
Matt Crooke
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i would agree, it sounds like your stat my be stuck open....does it take a long time to reach full temp?
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  #4  
Old 04-26-2002, 10:57 AM
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I used 90 degree thermostat on my 400E this winter, my acutal coolant temperature was 100 degree, I then switched to OEM 80 degree thermostat since this February, my coolant temperature has been 90 degree since then.

Right after I switched thermostat, with 10 degree difference, I did notice slightly more power but my fuel economy got worse, from 14L/100km to 15L/100km, that was with winter gas though, in summer time I get much better than that.
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  #5  
Old 04-26-2002, 11:02 AM
Matt Crooke
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My view on this (and its only mine!) us that the engines were made to run with a 100 degrees stat in them, any variance from that causes problems.
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  #6  
Old 04-26-2002, 11:24 AM
David C Klasse's Avatar
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I am pretty sure it sounds like your thermostat has failed... constantly running the coolant through the radiator.

The coolant temp setting for open/close (usually 87 d) is the "optimal" temperature for the engine. Running it at a much lower temperature can lead to ineffeciency and premature wear.

The part is 10 bucks... cheap fix!
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  #7  
Old 04-26-2002, 08:02 PM
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Thumbs up Thanks to all who replied

I just want to thank all of you who replied.

I know that my stat is bad. And I have purchased a new one to put R&R already, I was merely curious.

The stat was a cheep fix but not 10, my stat is $47
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1993 400SEL (W140) 281K
1999 S500 (W140) 163K (Sold)
2002 S500 (W220) 72K
1999 S500 (W140) 88K
You cannot simultaneously prevent and prepare for war.
Albert Einstein (1879 - 1955)
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  #8  
Old 04-26-2002, 08:30 PM
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$47 ????

I got my OEM thermostat from Partshop here for only $21, I think my 400E uses the same thermostat as your W140's.
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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
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  #9  
Old 04-26-2002, 08:43 PM
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Re: Thanks to all who replied

Quote:
Originally posted by pilot2000
I just want to thank all of you who replied.

I know that my stat is bad. And I have purchased a new one to put R&R already, I was merely curious.

The stat was a cheep fix but not 10, my stat is $47
Still much cheaper than an engine rebuild.
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  #10  
Old 04-27-2002, 01:12 AM
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Definitely no two ways about it Sir.
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1993 400SEL (W140) 281K
1999 S500 (W140) 163K (Sold)
2002 S500 (W220) 72K
1999 S500 (W140) 88K
You cannot simultaneously prevent and prepare for war.
Albert Einstein (1879 - 1955)
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