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#1
04-26-2002, 02:03 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
__________________
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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#2
04-26-2002, 06:37 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.
__________________
Reno '93 300E 4Matic '98 Nissan Altima '00 Yamaha Road Star Silverado
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#3
04-26-2002, 07:52 AM
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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
04-26-2002, 09:57 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.
__________________
99 BMW 540i 6-speed 110K Km 03 SAAB 9-5 wagon 80K Km 92 400E (Sold) 245K km Still missing the days with the Benz, it kept me busy.
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#5
04-26-2002, 10:02 AM
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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
04-26-2002, 10:24 AM
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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!
__________________
2006 E350 w/ 155k miles (Daily Driver) Previous: 1993 300E 3.2L Sedan w/ close to about 300k miles 2003 E500 Brilliant Silver (Had 217k miles when totalled!) 1989 300E with 289,000 miles (had for <1 yr while in HI) 03 CLK 500 cabrio (Mom's) 2006 C230k (Dad's) 1999 S420 (Mom's/Dad's) 2000 C230k Sport sedans 2001 CLK320 Cabrio (Mom's) 1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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#7
04-26-2002, 07:02 PM
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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
__________________
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
04-26-2002, 07:30 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.
__________________
99 BMW 540i 6-speed 110K Km 03 SAAB 9-5 wagon 80K Km 92 400E (Sold) 245K km Still missing the days with the Benz, it kept me busy.
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#9
04-26-2002, 07:43 PM
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Re: Thanks to all who replied
Quote:
__________________
Reno '93 300E 4Matic '98 Nissan Altima '00 Yamaha Road Star Silverado
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#10
04-27-2002, 12:12 AM
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Definitely no two ways about it Sir.
__________________
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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