Low Temp Thermostat
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Joined: Dec 2014
Posts: 76
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From: Northern VA
C36 AMG 6spd; V8 M3
Low Temp Thermostat
Anybody using a different thermostat to lower their coolant temps? I believe the stock one is set to start opening when coolant reaches 87*C.
I had a 79*C sitting around so I decided to install it to see how it faired in the hot summer weather. So far so good, normal engine temps came down from 87-95* to 79-83ish. Engine feels like it maintains that peppy-ness long after a cold start.
I like it but I’m wondering if it will cause any accelerated long term wear on internals. Also, I’ve read that engines running below normal operating temperature can cause oil sludge issues. I’m thinking that’s if it’s drastically lower tho.
I had a 79*C sitting around so I decided to install it to see how it faired in the hot summer weather. So far so good, normal engine temps came down from 87-95* to 79-83ish. Engine feels like it maintains that peppy-ness long after a cold start.
I like it but I’m wondering if it will cause any accelerated long term wear on internals. Also, I’ve read that engines running below normal operating temperature can cause oil sludge issues. I’m thinking that’s if it’s drastically lower tho.
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Joined: Dec 2014
Posts: 76
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From: Northern VA
C36 AMG 6spd; V8 M3
My car starts to feel a bit sluggish after the engine has fully warmed up and nearing 95*. On acceleration it just feels like timing is being pulled. With the new thermostat in, that sluggishness is gone.
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Joined: Mar 2005
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From: Friendswood, TX
99 C43, 73 911 targa
I’m with you. The fellow who owned my car before me put a 89-90 deg thermostat in and in Houston it’s 95 to 100 everyday, so I’m seeing temps getting over the 100 mark on the gauge.. I’m thinking I should find and install a 10 degree lower stat in my engine.
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12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Those engines are designed to run normally at hotter temps compared to other engines. Make sure however that the cooling system is pressurized correctly. Check or change the expansion tank cap as that ensures the pressure is right. They do fail as I know from experience, when steam started to spew out of the engine compartment after going up a mountain road. Changed cap, never a problem since.
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Joined: Dec 2014
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From: Northern VA
C36 AMG 6spd; V8 M3
Here's the part# for the 79*C if you want to give it a try: 100-200-07-15
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Joined: Dec 2014
Posts: 76
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From: Northern VA
C36 AMG 6spd; V8 M3
Those engines are designed to run normally at hotter temps compared to other engines. Make sure however that the cooling system is pressurized correctly. Check or change the expansion tank cap as that ensures the pressure is right. They do fail as I know from experience, when steam started to spew out of the engine compartment after going up a mountain road. Changed cap, never a problem since.
The lower temp thermostat makes the engine feel more lively and I like it. Nonetheless, I am still a bit skeptical about running this engine at a lower temp than it's supposedly designed for.
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Joined: Mar 2005
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From: Friendswood, TX
99 C43, 73 911 targa
Chutak,
thanks for the info, just ordered a thermostat, I’ll have it installed at my next service stop. I would think the reason for the higher temp I has to do with emissions and clean running, at the expense of performance and reliability in the long term. I think any time an engine runs at higher than normal temperatures it will affect the long term reliability.
im going with the 79deg C thermostat..
thanks for the info, just ordered a thermostat, I’ll have it installed at my next service stop. I would think the reason for the higher temp I has to do with emissions and clean running, at the expense of performance and reliability in the long term. I think any time an engine runs at higher than normal temperatures it will affect the long term reliability.
im going with the 79deg C thermostat..
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
I didn't heard about (79C)..?!?,,
the optional temps. are (87C) or (80C) or (71C),
I don't think (7C) only will deserve it,,
if you want more opening temp. range, then better to go with (71C)..
-;ZAYED;-
the optional temps. are (87C) or (80C) or (71C),
I don't think (7C) only will deserve it,,
if you want more opening temp. range, then better to go with (71C)..
-;ZAYED;-
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Joined: Dec 2014
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From: Northern VA
C36 AMG 6spd; V8 M3
Chutak,
thanks for the info, just ordered a thermostat, I’ll have it installed at my next service stop. I would think the reason for the higher temp I has to do with emissions and clean running, at the expense of performance and reliability in the long term. I think any time an engine runs at higher than normal temperatures it will affect the long term reliability.
im going with the 79deg C thermostat..
thanks for the info, just ordered a thermostat, I’ll have it installed at my next service stop. I would think the reason for the higher temp I has to do with emissions and clean running, at the expense of performance and reliability in the long term. I think any time an engine runs at higher than normal temperatures it will affect the long term reliability.
im going with the 79deg C thermostat..
Thread Starter
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Joined: Dec 2014
Posts: 76
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From: Northern VA
C36 AMG 6spd; V8 M3
Honestly, 79C seems like enough for my climate. Ideally, I'd go for a 80-82C if there was one for my car, just to keep temps closer to "design" but still tolerable.
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Joined: Mar 2005
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From: Friendswood, TX
99 C43, 73 911 targa
Zayed, are there part numbers available for lower temp thermostats for M113?
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
Sure bro.,
"Wahler" makes (87C) & (71C), for all "M112's" & "M113's",,
i have (71C) now, it's way better than OEM (87C), specially in my damn climate..
-;ZAYED;-
"Wahler" makes (87C) & (71C), for all "M112's" & "M113's",,
i have (71C) now, it's way better than OEM (87C), specially in my damn climate..
-;ZAYED;-
Member
Joined: Mar 2005
Posts: 173
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From: Friendswood, TX
99 C43, 73 911 targa
I now have a 71 on order for my M113��
many thanks Zayed. And Chita for getting my thoughts churning.
Anyone in US want the low temp for C36 engine? PM me and I’ll forward it to you for postage cost.
many thanks Zayed. And Chita for getting my thoughts churning.
Anyone in US want the low temp for C36 engine? PM me and I’ll forward it to you for postage cost.
Member
Joined: Mar 2005
Posts: 173
Likes: 34
From: Friendswood, TX
99 C43, 73 911 targa
Chutak,
first off, apologies for not paying attention to my spell checker, as it hammered your “name” ...;(
Just PM me your address and I’ll send it along when it arrives. I’m a fan of C36s as well, btw.
first off, apologies for not paying attention to my spell checker, as it hammered your “name” ...;(
Just PM me your address and I’ll send it along when it arrives. I’m a fan of C36s as well, btw.
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From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
