vinnybenz

Just acquired a 2018 S560 4matic. It has 35000km/22000 miles. I've noticed at typical city driving, there is a slightly noticeable vibration that you can feel through the steering wheel and more so while stopped at a traffic light. I was wondering if a transmission reflash from the previous owner's style of driving would eliminate this vibration. Also, is it true that only 4 cylinders are working at low speeds? If so, would that be the cause of the vibrations?
Thank you all

Sean._.S

The S560 does have cylinder deactivation though that usually doesn't cause odd vibrations. From what you've said, your car may need new motor mounts.(Quite odd as your car has low mileage).

vinnybenz

Hi Sean,

For all out there, I think I may have exaggerated the 'vibration'. It's not any thing strong, it's just a vibration that most vehicles have and most notable when sitting at a stoplight. I just feel that it shouldn't be as noticeable in a S-Class.

MBNUT1

Bad motor mounts will result in idle and off idle vibration

Jud Chapin

I have a '16 S coupe and you can't even tell the engine is running at idle.

Denis Osullivan

Try a few tanks of 93 Octane as lease owners tend to use regular gas.

vinnybenz

Hi, I always use 93 octane. Do most of you folks experience the quietness that Jud just mentioned?

MBNUT1

I can't tell that the engine is running at idle on my 2010 E350 V6 with 135K miles. Reminders me of the '59 220SE I had in college. The car was so smooth and quiet that as I was waiting to pull into the street after I got new tires, one old guy on a bench commented to the guy next to him how quiet it was. Conclusion you shouldn't hear or feel anything in an S Class at idle.

vinnybenz

Wow, now I'm worried. Maybe it was the gas I filled up with at a dinky convenience store, 91 octane. I hope that's the case. 93 octane is hard to find here in Windsor Canada, anyone know of a brand with 93?
Thanks all

MBNUT1

It should run just fine on 91 octane. It could be bad gas but that should clear up with a refill of premium.

vinnybenz

Ok, just to be clear, almost all of you experience no noticeable engine vibration or noise while sitting in idle, usually at a stoplight? All is smooth and quiet, right?

blackbullit

I do notice slight vibration at idle in Drive when stopped. It resolves as soon as I release the brakes. Seems this is due to the 4 cylinder mode which occurs at rest to save gas.

Denis Osullivan

Assuming you have a M176 engine in your 2019 S560, the four cylinder shutoff is active in the engine speed range between 900 and 3250 rpm provided the driver has selected mode For E with the Dynamic Select switch. Cylinder shutoff is inactive in all other transmission modes.

vinnybenz

So 'blackbullit' do you drive in 'E' mode as Denis is suggesting or usually in the default 'Comfort' mode. I'm just simply asking the forum members to mention the drive train idle smoothness which is usually in Comfort mode. Not getting many responses tho.

Jud Chapin

My '16 S coupe is in "comfort" mode always and as mentioned, I can't tell the engine is running when idling. I'll try it in the other mode, sport I believe, next time I drive the car and report back. How does yours idle when in comfort mode?

I remember my '02 CL500 had a nasty vibration at idle. I think they all did

badq45t

WE can only get 91 gas on California, I did top in some 101 octane race gas (just 2 gallons) and didn't notice much of a difference. If your still under a CPO warranty time to take to the dealership ASAP

vinnybenz

I can still feel a slight engine vibration while holding the steering wheel. I just filled up with Mobil 93 octane and will let the forum know any results.

blackbullit

I notice this vibration with Dynamic setting in either S or C. Makes me wonder if the 4 cylinder mode actually comes on at idle with brakes applied in any Dynamic setting. The relationship of RPM and 4 cylinder mode may only be applicable once brakes are released.

Jud Chapin

As an update, there is absolutely no difference in idle between "comfort" and "sport" on my '16 S coupe. You can't tell the car is running in either mode.

vinnybenz

Well into a quarter tank of 93 octane and the car seems somewhat better, however the gas usage seems to be a tad higher. I'm at 15 L/100 km or 18.8 miles per gallon. Does that line up with you folks?

Donnymac

17S. Zero vibration at idle on Chevron 91. However at 75/80 mph, harmonic vib in steering wheel and seat.

Denis Osullivan

You have a bent rim that is causing those 75/80 vibrations. Balancing the tires will not correct it. Been there , done that.

SW20S

No such vibration in mine, The engine is notably smoother and more refined than the V8 in my previous 2017 LS460L.

W205C43PFL

Bent rim being most likely or it is the balancing of the driveshaft. Especially being "harmonic vibration", although completely different vehicle (completely different class and different purpose > luxury vs performance) but exact same symptoms:
https://mbworld.org/forums/c450-c43-...vibration.html

Donnymac

Thank you sir. Given my pothole history, that makes 100% perfect sense. Should’ve thought of that myself.