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Old 04-17-2002, 12:25 PM
Posts: n/a
New to 97 S320 and have a few ?'s

When I start the car in the morning and drive I noticed it does not upshift as easy as when the car is warm. I revs to 3,000 instead of the usuall 2,000rpm. I remember my 4Runner doing the same to help warm up the car faster. Is this the same?
Also what grade of oil should I use 20w 50?
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Old 04-17-2002, 03:13 PM
Registered User
Join Date: Oct 2001
Location: Vienna, WV
Posts: 121
My 95 S320 is designed to idle fast until the engine warms up a little. It is in the manual. On the subject of oil weight you'll get a lot of opinions, but very few will suggest 20W-50 if the engine is in good shape. Most will suggest 5W-30 to 0W-40. Many will suggest Mobil1 synthetic. That's what I use.
Tom Savage
Vienna, WV
1984 300D Euro
1995 S320
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Old 04-17-2002, 06:36 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Yes, the engine revs higher in 2nd gear when coolant temp is below 35 D Celsius (722.6 trans), or if engine revs to 3100 RPM. This is done to warm up the cat faster.
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
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1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 04-17-2002, 07:06 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Yep, there is an upshift delay valve which delays the shift from 2nd to 3rd, keeping the car at a higher rpm. Lets the catalytic converter to warm up faster to reduce smog emissions.
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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Old 04-17-2002, 10:06 PM
Posts: n/a
COOL! I used the search feature and it looks like some dealers don't know what they are talking about
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Old 04-19-2002, 10:23 PM
it leaks, its german
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
97 140 cars run the 722.6, software driven upshift delay.

I run rotella 15/40 in most 103's and 104's but, it's kinda warm around here 9 months out of the year. Look in the service book, it'll get you on the right path. (unless you have a MM for the car)

Project Smoker, '87 603 powered wagon
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Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
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