Quadcammer

um, why the hell would you do this?

pfl

Btw everyone, I paid over $200 for just Royal Purple oil and it made no difference... the car still goes to 287 oil temp and limps. I'm not saying it did not working for AutoTech Racing, but for me, it did not. I believe our cars don't have enough cooling capacity.


There has been multiple threads about this very issue by multiple owners, specially the 2012+ cars. This is an embarrassment for AMG!! (Yes, I have had a case open since Sep 2013 with no resolution - you can read my other posts on this).

prindone

The C63 of my bro dont have this problem and my 2007 C63 estate too!

jcfay

Alright, as a new 2014 C63 owner, now in Summertime here in the Northeast US, I noticed my oil temps yesterday peak at about 235F. It was 100 outside, was driving in traffic, but I'm wondering again if this is, in fact, problematic? When does limp mode kick in? I'm just wondering at which temp I should start to get worried and look for problems/solutions.

whoover

I regularly get to 245 on the uphill run to my house in M. It's a very twisty road and I am either in 2 or 3 with revs up for one mile. (We have mirrors installed on the road so you can "see" around each curve, making this drive insanely fun.)

The engine doesn't have a limp mode. The engine management does retard timing to cut power at high temperature. I'm not sure that anyone knows exactly when, but people who track their cars report this happens around 275. Limp mode is a transmission feature, where it picks a gear and won't let you shift out of it. It does this under various conditions, with high transmission oil temperature being one. We don't have a transmission oil temperature gauge so it's even harder to know at what temp this happens, but it too seems to be when oil temperature has exceeded 275.

Until you start seeing 260, there's nothing to worry about.

Ingenieur

100 F ambient in stop & go traffic?
Peaked at 235...what was the average?
When you got to some open road did it drop down? To what?
Doesn't sound like an issue

jcfay

thanks, gents. it was probably hotter than 100 on the pavement, of course, but the car thermometer was showing 100. I'd say it ranged from 220 up to 235, with temps dropping as I was able to get some speed and clean air on the highway. But it sounds like it ain't an issue which is great.

papashango

What is the normal temperature supposed to be in Celcius when cruising or when doing some spirited driving?

Ingenieur

I see 95 to 110 max
Very seldom 110, only if pushing hard up a steep grade
105 is usually the max
Normal running 95 to 100

whoover

And the 245 I regularly see is 118 C. The temps that Ingenieur sees I will record only if I'm not having fun. And since I usually have fun, those are pretty rare.

Keep in mind that a P31 or 507 will run hotter when pushed. Also, the facelift cars with MCT transmissions are reported to run about 15 degrees F hotter than torque-convertor cars. I have no idea why that would be. I can see a small effect from the extra fluid in the torque convertor keeping the tranny a bit cooler, with conduction tending to equalize engine and transmission temperature. (The 44O cooling package upgrades the transmission oil cooler as well as the engine oil cooler.) But 15 degrees seems a lot. In any case, 2012 and later cars run hotter than earlier ones.

Ingenieur

5-7% grade
~12 miles
Very twisty
Avg speed 50-60 mph
Avg rpm 4000 to 5000 rpm with many redline shifts
Peaks at 220 F 105 C, maybe a few degrees higher 110 or so
12 minutes or so
Ambient 80 F
>2000' ASL

Has nothing to do with the drivers emotional state
Have made the run dozens of times
On the backside downhill back to 95 C within 3-5 minutes

About the only time I really put miles on the car is for enjoyment
Don't think I've seen 230 F often
One must drive within the limits of the machine
Temperatures, tires, brakes, etc
Not many can aquire this skill called mechanical sympathy
Everyone is senna lol in a 4000 lb passenger sedan

I'm sure I could get mine to 240+ but why?
I garantee I can travel just as quickly as the guy who does with my oil running 15-20 deg F cooler
Frantic doesn't mean fast, usually the opposite

Ingenieur

I try to clean all coils once a year
Car on lift
Remove cladding/access panels
Spray with a commercial grade coil cleaner, be careful can be harsh
Power wash from BEHIND to blow lodged debris out

Depending on state of neglect this can improve system efficiency 10-30%

It's messy but I inspect and wash the chassis at the same time
Usually in the spring to get all the salt and crud off

Ingenieur

Another point that can't be overstated
The temp you see is the sump temp
AFTER it has cooled/lubed the engine
It is then pumped through the cooler and sheds the heat
As much as 20-30 degree depending on OAT, rpm and road speed
So if you see 240 the engine may be getting <220

zibby43

I've posted this in another thread here but even when I'm thrashing the car in hot weather, my temperatures stabilize pretty quickly:



I imagine that tracking the car in hot weather is a different story.

AMG Boost

Crusing in a summer day of 25c my oil temps are a steady 103c. If I go into stop and go traffic usually 109c oil temps. During sprinted driving the most I have ever seen is maybe 113c oil temp. I do Autox as well.

-Marlin-

My oil temp stays at around 212F.

I let it get up to 190F before getting into it. My car has been great and I haven't had an issue with dramatic oil temp fluctuations. My engine temp stays around 190F.

jmueller

In the Daytona video posted on page 1, those oil temps are very very very lively. My oil temps seem to stay pretty stable, but are high. On a 35 MPH cruise to work for 10 miles I am at 219f / 104c and if I push her I can easily get the temps to 235f / 112c. The reason I comment on the instability of those temps in the video is that those temps seem to drop 10/20 degrees in a matter of seconds. I really don't think that is normal? It also looks like he has fog lights cut out which on the passenger side, would direct a ton of air right over the oil cooler. In otherwords, I think that video is a bit misleading.

Ingenieur

OT a bit but although the display says 177 F (80 C) oil is OK to play, I wait until the oil > water temp and that is usually 195 F range, I consider that pretty much stabilized


another OT
for those seeing oil temps 230 range what is the water temperature?


again, the displayed oil temp is sump, not delivered to the engine after cooling


if the water temp is stabile imo everything is OK, the oil is doing it's job by getting hotter, ie more friction and more heat is being generated,
it is then cooled in a thermostatically controlled oil cooler and returns to the engine at a much lower temp

Illegal Machine

Yesterday with a little romping I was around 245 before cooling to the high 230's. Normally sitting in the 200-220F.

papashango

I've never really paid attention to mine which is why I was asking. Next time I take the car I will be sure to keep a look at it. Mostly my driving is relatively spirited and the car is in S mode if not M with traction in Sport mode so they should be on the higher side I would assume.

Ingenieur

Just had mine out for a drive in the mountains
I intentionally allowed it to stabilize
H2O 194 f
Oil 212 f
90 C & 100 C
Rock steady on level constant load

Does anyone know for sure the oil temp sensor location?
What is the setpoint of our water thermostat? 90 C?

Mort

I don't think the water temp changes much. Mine stay close to 91C/195F when the oil temp rises and that seems to be pretty standard from what I have seen.

Ingenieur

That is what I have seen too
This tells me the cooling system is keeping up and engine temps are not running away
The oil is working more so it gets hotter
But is cooled to whatever temp the oil cooler stat is set for
But the oil going to the engine is at that temp not the hot sump temp
Just like the water leaving the engine is >195 f before going thru the radiator and being cooled to a mixed/stat regulated 195 f

Is the oil temp sensor in the sump? Most are combined with the level sensor
The water sensor measures the controlled temp, ie after the stat and radiator
Pretty sure the oil temp is before

whoover

What oil cooler stat? Are you referring to when the fan comes on? That fan is part of the problem with high-speed, high-power runs because it blocks air. That's why it is removed in favor of an adequate cooler in the 44O package. It does help at low speeds in very hot weather.

The other source of engine oil heat is the transmission. The tranny is only oil-cooled so engine coolant has no effect. And it gets much hotter in the MCT. On second thought, that's probably the reason that post-facelift engines run hotter. Shifts are enabled by friction material, not a torque convertor so it makes sense that a lot of gear changes will heat things up quickly. The 44O upgrades the transmission oil cooler size even more than it upgrades the engine oil cooler. As far as the transmission is concerned, the engine that it's bolted to is just a big heat sink.

Ingenieur

There is a stat built into the front cooler housing

Thr tranny oil and engine oil are two isolated circuits

The thread is about engine oil temp

The tranny cooler has a stat too