Engine/oil temp
Thread Starter
Super Member
Joined: May 2011
Posts: 569
Likes: 3
From: Lynnwood,WA
07 E63
Engine/oil temp
This is more curiosity then anything, when I'm in stop and go traffic my engine/oil temps seem rise really quickly...109c...111c I've had it go as high as 117c. At 117c the car starts to idle really though and get a little "jerky". I get that it will rise in traffic but to me it seems excessive. Is this normal? at what temp should I start to worry?
Senior Member
Joined: Feb 2013
Posts: 408
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From: AZ
C32, C55, 08 E63
It shouldn't be too hot up in WA even in the summer so that seems a bit hot considering those kind of ambient temps. I have sat in some stop and go traffic here in AZ with ambient temps around 110 and I only usually see 105-110. That being said, I was up in northern AZ going up a hill doing about 10-20mph and my temps got all the way up to 120. I was able to get out of the town and get back up to speed and it dropped back down so I didn't worry too much. I'd say anything higher than 130 you really really need to worry as that's 270F and close to boiling for most synthetics.
I'd check your cooler for any debris and if it's clear maybe have a shop look at it for possible clogs in the lines or cooler itself.
I'd check your cooler for any debris and if it's clear maybe have a shop look at it for possible clogs in the lines or cooler itself.
Thread Starter
Super Member
Joined: May 2011
Posts: 569
Likes: 3
From: Lynnwood,WA
07 E63
It shouldn't be too hot up in WA even in the summer so that seems a bit hot considering those kind of ambient temps. I have sat in some stop and go traffic here in AZ with ambient temps around 110 and I only usually see 105-110. That being said, I was up in northern AZ going up a hill doing about 10-20mph and my temps got all the way up to 120. I was able to get out of the town and get back up to speed and it dropped back down so I didn't worry too much. I'd say anything higher than 130 you really really need to worry as that's 270F and close to boiling for most synthetics. I'd check your cooler for any debris and if it's clear maybe have a shop look at it for possible clogs in the lines or cooler itself.
MBWorld Fanatic!
Joined: Jun 2013
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From: 'Merica
'04 E55 (Gone but not forgotten), '13 C63 P31 (RIP), another '13 C63 PP
That seems pretty warm. It was pretty hot here in GA a couple weeks ago. Ambient temps at 100F, engine temps were 200-210F (93-99C) driving around downtown in stop and go traffic.
Thread Starter
Super Member
Joined: May 2011
Posts: 569
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From: Lynnwood,WA
07 E63
Normal driving regardless of ambient temp it's usually between 99c-103c.. It's just in prolonged stop and go that things get crazy.. This Sunday I'll be in 104+ ambient temps so I'll pay more attention and see how it goes.
MBWorld Fanatic!
Joined: Jun 2013
Posts: 1,814
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From: 'Merica
'04 E55 (Gone but not forgotten), '13 C63 P31 (RIP), another '13 C63 PP
I just noticed you had a 63! I should note my car is a 55.
Senior Member
Joined: Feb 2013
Posts: 408
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From: AZ
C32, C55, 08 E63
Yea, eastern Washington can get pretty hot!! If the cooler/lines were clogged it wouldn't necessarily run hot all the time just make it run extremely hot when there is little to no air flow. Even at say, 50% circulation you're still going to have air flow over the cooler, the engine and the oil pan so it will still run normal, but when you are stopped or going under 20 there is little to no air flow and the fans can't pull enough air to cool off the oil quick enough to keep the temps down at a diminished flow rate.
I'd also check to make sure you have enough oil in the car too just to eliminate that as a possibility. My bet is that there is debris in the cooler though.
I'd also check to make sure you have enough oil in the car too just to eliminate that as a possibility. My bet is that there is debris in the cooler though.
