S vs W setting in 1999 and Fuel efficiency E320 - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 12-13-2006, 04:22 PM Thread Starter
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S vs W setting in 1999 and Fuel efficiency E320

Hi,
Can someone please tell me what the difference is between W vs S ride setting in a 1999 E320? I know one is for winter and the other is for standard condition but what is the technical difference the two.

Would there be a difference in fuel economy between the two settings? Iam getting about 20 mpg in city+highway driving with W setting. Is this avg or very low?

This car has been driven mostly with W setting even in California, about 55k miles. If I change to S setting would I encounter any problems?

Thanks in advance.
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post #2 of 4 (permalink) Old 12-13-2006, 04:51 PM
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Quote:
Originally Posted by dirtyharyus
Hi,
Can someone please tell me what the difference is between W vs S ride setting in a 1999 E320? I know one is for winter and the other is for standard condition but what is the technical difference the two.

Would there be a difference in fuel economy between the two settings? Iam getting about 20 mpg in city+highway driving with W setting. Is this avg or very low?

This car has been driven mostly with W setting even in California, about 55k miles. If I change to S setting would I encounter any problems?

Thanks in advance.
I'm just curious why anyone would second-guess the manual on this?

Absent very slippery road conditions leave it in S. Snow, mud, ice etc. put it in W.

If anything you'd probably notice a mild increase in mileage if you mostly do city driving. W starts the car in second gear instead of first. Thus you're loading your engine more, more strain on it, more fuel usage, etc.

Take care and enjoy the drive,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #3 of 4 (permalink) Old 12-13-2006, 07:01 PM
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Per my 2002 Owner's Manual:


The transmission is provided with a selector switch for Standard “S” and Winter/Wet (snow and ice) “W” program modes.

S Standard mode

Press switch on symbol “S”. Use this mode for all regular driving. The vehicle starts out in 1st gear.

Accelerator Operation:
Fast on = depressing the accelerator pedal quickly (not into kickdown position) while driving continuously, rather than depressing the accelerator pedal in the usual manner, will cause the automatic transmission to shift down into a lower gear. This gear shifting process is dependent on the current vehicle speed.
Fast off = there will be no upshift when releasing the accelerator pedal quickly, e.g. using the engine’s braking power during performance driving.

W Winter/Wet (snow and ice) mode

Press switch on symbol “W”. The vehicle starts out in 2nd gear, except with selector lever in 1st gear, or with accelerator pedal in kick-down position. The “W” mode helps to improve traction and driving stability of the vehicle. The gear shifting process occurs at lower vehicle and engine speeds than in the “S” program mode.

Caution!
Never change the program mode when the selector lever is out of position “P”. It could result in a change of driving characteristics for which you may not be prepared.

Important!
Always be certain of the program mode selected since the vehicle driving characteristics change with the selection of the program mode. Dependent on the program mode selector switch position “S” or “W” and the gear selector lever in position “R”, the ratio of power transmission changes.
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post #4 of 4 (permalink) Old 12-13-2006, 07:26 PM
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Quote:
Originally Posted by dirtyharyus
Would there be a difference in fuel economy between the two settings? Iam getting about 20 mpg in city+highway driving with W setting. Is this avg or very low?
Nice nickname, reminds me a little of some roles Clint Eastwood played.

Based on my 2001 E320, you are doing well to be getting the combined 20 mpg, but I have never used the "W" position on my car. The main reason being is that I bought it last June so have not driven in winter conditions yet, and don't plan to. I have two daily beaters that will experience the snow and ice.

Like Greg wrote, don't second-guess your manual. The Daimler engineers were not born yesterday, and believe me, the winters in Germany are much worse that the ones you are seeing in California.

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