I read a while back that someone's electric fan on their oil cooler decided to stop working, and their oil got into the 260 range. I've heard a high pitch fan come on before and was assuming it was for the oil cooler. Mine usually runs in the high 22x range and sometimes into the low 240's. I know when the oil is "cool" the numerals in the dash are blue, if it becomes "overheated", do they go from white to red possibly? And also does anyone know at what temp the cooling fan for the oil cooler comes on? Thanks, and if it helps the car is a 2012, with about 5thousand miles.

 

I have the same high pitch noise I think ( I posted a thread with a video )..does it come on around 80C and is kinda coming from the driver side? My car runs no where near that hot..that seems pretty hot..mine runs <115C (Are you talking about F?) and that's when I'm ripping it.

 

in daily driving outside temp. 23C to 28C oil temp. 89C to91C water temp. 1 to 2 degrees lower.

 

WHAT!?!?! 23C Oil temp????? My car starts off @ 30C in the morning You're water temp is about the same as mine..mine goes a bit higher if it's a super hot day and I'm ripping around

What kinda oil are you using? Lol

 

Normal driving, I'm in the 210's. In traffic, I'll creep into the 230's

 

i noticed that before i had the B service done (which included an oil change), i seldom hit 210 - and i'm in Texas!!.. now after the service - and the dealer used Valvoline, i easily hit 200-210.. not sure if its because of the new oil compared the the previous one it had (i'm guessing Mobil1).

 

I am normally never higher than 200 in fl heat/traffic And sometimes I'll drive it real easy in comfort and I've seen it go down to 172-180. under a bunch of runs 215-220

 

Damn, what kind of oil are you using? I'm in California and those are my temps regardless of where I am in the bay.

 

i usually run 210-225 depending on how hard i drive.

 

I'm seeing 210 to 220 normal driving and 230 to 240+ when aggressive.

 

hi avery.whss
read first part of my post in daily driving outside temp.23C yo 28C.

 

213ish normal. 253 is the highest I have seen driving hard on the street. 268 on the track in 72 degree weather. I am very worried about hitting the track again in September.

 

I've seen 248 on a warm day in 40 minutes of stop and go traffic. Have not dared to track it yet.

 

Reached 266 in 80 degree F weather on track tat SPR this past weekend. Not good, hot, hot, hot but no limp mode which seems to be 270 for me. My normal street temp is 215 these days.

 

Anybody notice at what temp the fan kicks on, in fahrenheit?

 

So some people think that the oil is ruined in the 260 range, and the cars ecu doesn't put the vehicle in "limp mode" until 270? Something isn't adding up.

 

I thought some folks also reported limp mode kicking in at different temps for different MY's. like the newer C63s have a lower threshold.

 

IIRC, on at 235, off at 225

 

ditto.

 

+1 on that. With summer ambient temperatures, mine runs at about 105 Celsius (220F) in city driving and about 115 deg C (240F) when pushed hard.

 

In the DC metro area, during rush hour (I avg around 8mpg at around 10mph over a 30 mile trip each way), my car hits around 230'F

Cruising at speed, it hovers between 210 and 215'F

 

From http://www.carcraft.com/techarticles...il_technology/:

"Conventional oils will tolerate engine oil sump temperatures of up to 250 to as much as 275 degrees F without difficulty. According to Quaker State engineer Mark Farner, oils like Quaker State's full synthetics can easily withstand sump temperatures in excess of 300 degrees F, and he says that some oval track race teams are experimenting with temperatures as high as 350 degrees F. For a typical wet-sump engine, 300 degrees F is still extremely hot, but Farner says that synthetics, because of their molecular makeup, are better suited to withstand these temperatures. The downside is that additive packages do tend to break down faster in high-temperature environments, so if you plan on running oil temperatures in excess of 300 degrees, this would mean changing the oil after every track event regardless of the mileage."

While I have no knowledge of the specific testing for MB 229.51 approval, most modern oil certification tests include running the oil at 150 deg C (300F) for 100+ hours without significant degradation of the lubrication properties.

If you're repeatedly seeing your oil temperatures creep up into the 125 deg C (250F) area, chances are you've got other issues to worry about.

 

I think you guys are using the term 'limp mode' a bit loosely. Limp mode is associated with a failed sensor and is a pretty severe condition. 270F (if that's the right temp) would likely cause a reduction in timing, as would an increase in water temperature over a certain threshold for example.

As long as you're using a fully synthetic oil, I wouldn't worry until you're seeing 260-270F. If that happens, stop using the factory 10W30 and get a hotter grade oil. 10W30 is a compromise that the manufacturer uses for a good all-year-round oil. If you plan on racing in 100F weather, you better believe you have to make some tweaks because that is not expected use for this car. There is only so much that can be done in the factory and we need to take care of these cars when we go to these extreme cases.

 

regular mobie one 4-40. i always drain the oil cooler and then run half a quart through the motor and drain that and then add new oil.

 

If you're trying to tell us that the factory fill on a C63 is 10W30, you're mistaken.

The M156 motor requires MB 229.51 spec 5W40 oil, or possibly (again, MB 229.51 spec) 0W40, year-round in pretty much any climate. Anything thinner on the top end and you will cook the engine.