+1

My water temp is always at 197-201....anyone know at what water temp and oil temp does the ECU start pulling timing and powering back?

 

Bringing back old post.

I usually drive my 2012 C63 in C mode. Today, I tested it in S+. A few spirited acceleration of less than 5 mins in total, my oil temp went to 240F (115 deg cel) and the whistling sound of the fan was apparent quite suddenly and got really loud. Startled me actually thinking that I may have been abit too rough with the accelerations.

How can it be? Just less than 5 hard accelerations & not even WOT..... quite amazed that the engine does get heated up easily. Plus the outside weather temp is only 52F (14 deg cel).

Anyone experiencing this in S+??

 

Yep...happens to me too. A few minutes in S+ or M and I'm up over 240 with the embarrassing loud fan!

 

277F oil temp is my magic number to go into limp mode on the track.

 

Worry at 270F if temp climbs to 290F. Especially if oil does not cool under coast or descent. SAE says "flash" occurs at 390F . That's when oil is not oil ,only fumes that will ignite.

 

+1 to your post my friend.
I have a 2012 like yourself... After the 1000 mile break in period, I started playing around with ALL the "modes". My commute home from work is 6 miles.
The last stretch (2 miles) is all highway, where I would PUNCH it in "S+" or downshift to 2nd in "M" while cruising at about 40 mph and max out each gear to about 100-110 (keep in mind this is only for 2 miles or so).

Hence, my oil temp would SOAR from about 210 to 240-255 degrees in that short stretch, fan whistling and everything else.

That said, I am used to it by now and I believe it's normal. I've never seen it go past 255, and recently my "Check Oil at Next Refueling" warning light kept flashing on the dash.

I've since added about 1.5 quarts and I am good to go

Again, I wouldn't worry too much about it. However, check you oil levels now and then. The dipstick has 3 red "dots" or wtvr on it. I THINK the oil should be at or near the "top" red dot closest to the pull handle.

Good luck

 

How much hotter? I was up to 113C (about 235F) with No AC and really slow moving traffic after about 10 minutes. The outside temp was not hot. Water was only up about 2C to 94C

I am normally at 100C or 220 F for oil and 90-92C for Water in my normal country road driving.

 

Hey ~ thank you for the assurance !!! If your car is fine in that weather ~
I dont see any problem with my oil temp. Mines around 190 ~ 220 .
Thanks .

 

hi.
my friend borrowed my W166 ML63 M157 v8biturbo. He said the oil temp went above 300F, maybe 320F. Coolant temp around 250F. He pulled on the side of the hwy, screen flashed amber then red. Turned off the engine. It was towed to my house, headgasket is blown. Coolant is gushing underneath through the mid exhaust pipe when I tried to fill up from the reservoir while recirculating. Now, what’s the likely hood that it’s more than just head gasket plus exhaust gasket maybe?

 

That sucks and does not sound good, but we are non-turbo M156 guys so you might get a better answer in the W205 forum or the W166 forum. I hope it's not as bad as it sounds.