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#1
04-17-2002, 12:25 PM
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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? Thanks Ronn 
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#2
04-17-2002, 03:13 PM
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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.
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Tom Savage Vienna, WV 1984 300D Euro 1995 S320
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#3
04-17-2002, 06:36 PM
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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.
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2006 E350 w/ 155k miles (Daily Driver) Previous: 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) 2000 C230k Sport sedans 2001 CLK320 Cabrio (Mom's) 1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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#4
04-17-2002, 07:06 PM
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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.
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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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#5
04-17-2002, 10:06 PM
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COOL! I used the search feature and it looks like some dealers don't know what they are talking about
Ron
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#6
04-19-2002, 10:23 PM
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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) Joe
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Project Smoker, '87 603 powered wagon Hauler, 96 CTD can you say torque? Toy 73 Cougar xr7 convertible Acme Automotive Inc. Raleigh NC 919-881-0364
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