Most of the time my S550 runs 190, but certain times I look at the readout and it's 200 degrees, not very often? Maybe there is a reason for this? The car seems to run fine. Maybe it's the gauge readout?

 

Mine goes to 200 everyday and stays there while the engine is running.

 

Mine too.

 

Seconded? Thirded?

Mine too is what I'm saying.

 

Don't know why my temp says 190 degrees a lot of the time? I'd prefer to just have a gauge for both the temp and gas, even if they were not marked off exact, it's just what I'm use too.

 

My 2015 S550 sometimes reads 190, mostly 200 as well. No obvious reason for why one or the other.

 

200

 

Had my 2nd service done yesterday at 20,000 miles and my coolant level low indicator came on last week. So, I had to have my coolant topped off a little. Anyone else had this message pop up this early in the game? Probably nothing to worry about.

 

As long as you notice no leaks on your garage floor or smell coolant frying on engine parts, I would not worry about, could have been low all along. If it keeps going down, then worry and get it checked out.

 

I agree. I think it is just a one-time thing.

 

Mine runs at 200 and I do smell coolant, but no leaks....

 

Mine does too and the engine lags 🤦🏾*♂️

 

200 all the time after warm up.

 

190 to 200 depending on idle or load. Never lower or higher after warmup.

 

Same here, the only 2 temps I see are 190 and 200. ??? Never took notice of what I was doing but it's one or the other every day.

 

My v12 does that too. Sometimes it’s 190 other times it’s 200. Go figure.

 

You know, the fact of the matter is that most folks lease these cars and give them back at lease end. They are, for the most part, always covered under factory warranty. Most W222 owners care less about what temperature the coolant or the oil is running at. I know I don’t. I am a few clicks above my wife. She thinks about nothing to do with the car, she just wants to get in and drive, expecting me to know when the car needs gas, since I am her “Gas Man.”

I understand the more hands-on owners—like Katie who I am in awe over, as she changes her own oil in her Maybach—but MB deals to the masses these days and is ONLY interested in the bottom line. Can a “HOT” or “COLD” light be in our future? Probably not a “COLD” light—as I had in my 1956 Oldsmobile—as it would not be in the budget.

 

Ahh Streamliner your so nice. I also do the maintenance on the AMG GTC and the Ford van. First two years of college was aircraft mechanic school. I just read the directions and follow them. While Mercedes is different than American cars it’s not more difficult, just different.

Now do I look forward to doing car work? Well I tell you what if I have the directions and follow them I can usually get the job done quicker than me diving to the dealer and waiting for them to do it and it’s cheaper for me to do it. NOW I I generally won’t get all dirty till say after I get home from the gym. That way I’m already sweaty so it’s no big deal to work on the cars.

 

Personally, I wouldn't fly a plane if someone else told me they did my pre flight inspection and all was ok? Can you do it? Sure. But I find it irresponsible and a gamble to some degree. Yes they make these cars with a lot of lights and messages for people who don't check. I feel people have been conditioned from cars being more reliable, that it's not needed. When I was younger most people had common knowledge of car maintenance and safety. Todays culture is if something goes wrong they will blame it on the guy who "should have" caught that at the last dealer visit a year ago. I can't tell you how many times I have left a dealer or tire shop and found something overlooked. Checking your oil, and tire pressure is easy and a safety measure. Takes 5 minutes maybe once a week or so. This last week I did a quick inspection of my car on the lift as we are taking a road trip up to DC. Only have 5000 miles on "new tires" at purchase. Well.....on the inside right rear tire there was damage and cords showing. If I had not inspected this it was a guaranteed blow out on this trip. On the inside of tread on a new looking tire would surely be missed by most. A simple inspection probably saved me from and accident or injury. I could never put my confidence in someone else telling me all is OK. They have no skin in the game. I agree with Katie, between the time of going to the dealer and going back it's always a big deal. I am quicker, cheaper, and do a very efficient job correctly. As Katie said, I read and understand before I do, and don't bite off more than I can chew. I find MB different but no harder than other cars. It's not about saving money for me, it's control, being done correctly and convenience. But also confidence and responsibility. I can't trust a grease monkey with a HS education telling me all is good.......

 

Well, I would not fly a plane under those circumstances either, but I don't fly planes and a car is a bit different.

My first car was given to me by my older brother before I could drive. It was a 1956 Oldsmobile and it was a bit wrecked and running on 7 cylinders. I pulled the engine and completely rebuilt it, all by myself, with the exception that I sent the block out to be hot tanked and I had the valves & seats ground at a shop. After that, I overhauled and rebuilt several Corvette engines. Fast forward to today and I will admit that I have not checked the oil on a car for many years now. I take the cars to my MB dealer and I trust what they tell me. Recently, before a 1,000 mile round trip up to Napa, I took the car into my Firestone store and had them put it on the lift to check the tires. Everything was fine, but with only 15K miles on the Bridgestone's I wasn't surprised.

We all have different comfort levels with vehicle servicing. I put my trust in my MB & tire dealers, you put your trust in yourself, some just trust that all is OK, without so much as an oil change, until some light flashes on the dash. Oh well.

 

Analog gauges? Here is the mostly analog screen in the AMG. This picture was taken after about 160 miles of continuous running on the interstate between 80 and 86mph. Note the outside temp was 64. The coolant is 190, the engine oil is 200 and the transmission fluid is 185.

 

A) the temperature difference on the oil is negligible between 190 and 200.
B) engines perform better with higher temps--up to the point that::
B.1) the oil gets too thin
B.2) the water boils
C) water will not boil under 212 at sea level
C.1) with 14 pounds of pressure water does not boil until 240-odd degrees.
C.2) the Merc puts in the engines is "not too thin" until it gets into the 275 range.
D) engines LAST LONGER at higher temps as long as B.1 and B.2 are obeyed.

 

Yesterday I noticed my ‘19 S63 was at 217 degrees. Performance motors may run hotter and this is certainly true of the AMG 4.0 liter in my S63. Thought I would add the S63 in the mix of the S class discussion especially based on your comments.

 

I wouldn't worry about the number at all the car will tell you when its too hot. 180 was a number from long ago as a sweet spot number. It has zero comparison in newer vehicles.

Mitch Alsup abovehas the best explanation.

Thinking about it is your question the temperature or is it why does it only show 190 or 200 and never 193 or 201? I would guess they round up or down to avoid unwanted service for that car that is always 200 and is now 203.

 

Oh ya. It should be no worries. Reason it bounces 10 degrees is like you said it’s rounded off. My 2018 amg wagon generally ran 174 degrees. Definablely lower than most cars. Guess because they are squeezing 603 hp out of a 4 liter motor. My v6 e450 runs right around 205. That’s pretty common for today’s cars.