S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Wanting a 98-99 S420 Please help answer a few questions

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Old Sep 12, 2011 | 01:39 PM
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Question Wanting a 98-99 S420 Please help answer a few questions

Hello, I've mostly dabbled in the W202 and W203 forums on this website but it was the W140 I saw as a young boy that is responsible for my love of Mercedes and cars in general. I've had an 1985 BMW 5 series, 2002 Audi A4 (big mistake), and now a 2004 Saab 9-5 (even BIGGER mistake). I need to get back in a German car because no other auto maker comes close. I've been searching and studying for a few days and I think I've determined that a 98-99 S420 would fit my desires the best. This way I can get many of the options from the S500 without the headache of the air suspension.

Despite my research efforts, I still have a few easy questions that remain unclear. I hope you fine people can answer them quickly and concisely.

1. I generally know about the problem areas the W140 carries but I'm curious to know if they have been rectified in the 98-99 MY. Were the following weak spots improved by the 1998 production year:
*5-speed Automatic transmission
*AC system (evap box in dash)
*Window regulators
*Bose stereo
*Wiring harness (engine problem?)
*Catalytic converters prone to failure
*Mass airflow sensor

Also, what is the 0-60 acceleration time for the S420?

If I've forgotten any significant weak areas, please let me know.
I really love these cars as they have literally changed my life since I was a little boy. I hope to be able to own one soon. Thank you for any input you provide.
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Old Sep 13, 2011 | 05:17 PM
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From my previous experience W140 S320 I had problem with Mass air sensor $500 easy DIY job. I had Check engine light ON. I had some engine oil leaking which need Head gasket seal. Finally the major reason i sold it because transmission kinda slipping ($2K to fix)
S320 and S420 should be very similar and in my opinion they are under power. However, if you are looking for a freeway cruiser, this is a great car. Before you purchase it, take to a shop for fully inspection specially for oil leaking. Good luck !
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Old Sep 13, 2011 | 10:03 PM
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Hey, thanks charly.

I've youtubed some bids of the S420 acceleration and the engine does seem to be laboring a bit more than a V8 should. I would love an S500 but I want to avoid those pesky air struts at all costs. I was hoping the W140 wouldn't have tranny problems like the 7 series and Audi A8 but I guess that's asking too much.

I am also considering a late MY C43 but I hear those have a high tranny failure rate also.
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Old Sep 14, 2011 | 03:06 PM
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s320
I own a modified s320,I blew a S430 away with my straight 6.So buy the 500,or modify the 430.
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Old Sep 19, 2011 | 07:55 PM
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Originally Posted by nathandimond
Hello, I've mostly dabbled in the W202 and W203 forums on this website but it was the W140 I saw as a young boy that is responsible for my love of Mercedes and cars in general. I've had an 1985 BMW 5 series, 2002 Audi A4 (big mistake), and now a 2004 Saab 9-5 (even BIGGER mistake). I need to get back in a German car because no other auto maker comes close. I've been searching and studying for a few days and I think I've determined that a 98-99 S420 would fit my desires the best. This way I can get many of the options from the S500 without the headache of the air suspension.

Despite my research efforts, I still have a few easy questions that remain unclear. I hope you fine people can answer them quickly and concisely.

1. I generally know about the problem areas the W140 carries but I'm curious to know if they have been rectified in the 98-99 MY. Were the following weak spots improved by the 1998 production year:
*5-speed Automatic transmission
*AC system (evap box in dash)
*Window regulators
*Bose stereo
*Wiring harness (engine problem?)
*Catalytic converters prone to failure
*Mass airflow sensor

Also, what is the 0-60 acceleration time for the S420?

If I've forgotten any significant weak areas, please let me know.
I really love these cars as they have literally changed my life since I was a little boy. I hope to be able to own one soon. Thank you for any input you provide.

I have a 93 W140... I love my car...A/C fixed, all windows regulator work, my Bose system works great, all new wiring harness, engine runs awesome...I just drove from Markham to Waterloo and back...measured fuel used and mileage...got almost 21 MPG...and that's going above speed limit...won't say how much...but enough to make you grin...enough said...the W140's are awesome cars..regardless of year....as long as the owner takes care if it and put in the necessary money to maintain it.

Here is a 1998 S420 for sale....looks to be mint...so, call the person up and get it before someone else does...
http://ontario.kijiji.ca/c-cars-vehi...AdIdZ299162527
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Old Sep 20, 2011 | 12:05 AM
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Smile 1998 Mercedes S420

Hey! That is my car on KIJIJI. Thanks for referencing my link. The ad is correct, the car is near mint, I'm the second Owner and really NEVER winter driven.
I have had the car since March 2010, I just added up what I have spent on maintenance, just over $1500 since ownership.
I had the plastic oil tubes changed, the front suspension links and the cam magnets to solve an oil leak (from an Ottawa MB Dealer).
I have owned a 1997 S500 coupe as well. I really think the W140's are built like tanks, just like these forums state.
I have 4 cars in the stable and want to thin one out. I plan to store the car by end of October with a trickle charger on the battery.
If there are any W140 lovers out there, reply to the KIJIJI link.
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Old Sep 20, 2011 | 10:27 AM
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I live in Toronto, I just bought a 98 S420 with 279K off of a good friend for 3k. EVERYTHING in the car works, shifts great however there is a small oil leak which I will be checking into this week. What could the leaks be on a S420?

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Old Sep 20, 2011 | 08:26 PM
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Benzonline, your S420 is stunningly beautiful. I love a Mercedes in black, it looks almost exactly like the W140 I saw as a boy. What kind of fuel economy do you get in your S420? Are you satisfied with the power? How fast is your 0-60 and does it have adequate power for overtaking on the highway?
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Old Sep 20, 2011 | 08:49 PM
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Originally Posted by nathandimond
Benzonline, your S420 is stunningly beautiful. I love a Mercedes in black, it looks almost exactly like the W140 I saw as a boy. What kind of fuel economy do you get in your S420? Are you satisfied with the power? How fast is your 0-60 and does it have adequate power for overtaking on the
highway?
To answer your question about power, does it have adequate power? It does yes. Will it give you much of a "push you into your seat feel" yes and no.

The W140 is a heavy car and utterly smooth. You don't notice the power but if you look at the speedometer it's gaining quick. It's not a car you feel like speeding in anyways.

I wouldn't worry about loss of power in a 420. I didn't take the 500 due to leveling suspension and S320 is one thats the underpowered one.

For a fun fast time I'll take my C43!
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Old Sep 20, 2011 | 09:05 PM
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Originally Posted by Benzonline
I live in Toronto, I just bought a 98 S420 with 279K off of a good friend for 3k. EVERYTHING in the car works, shifts great however there is a small oil leak which I will be checking into this week. What could the leaks be on a S420?

Awesome...another 4.2 liter ride. Putting together a W140 Club here...you'll need to attend....with the money you saved...the beer is on you.
A small oil leak, maybe head gasket or oil pan gasket. Are you running synthetic oil?
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Old Sep 20, 2011 | 11:58 PM
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Okay chaps,

I just finished from driving a 1997 S500 with 94k miles. It was in mint condition and had impeccable service records. Everything worked beautifully and would seem like the obvious choice out of the three cars I tested today(01 740iL, 01 A8L, 97 S500).

But, I did not care for the ride. The majority of the time, the ride was heaven on wheels. However, when I drove over some sharp bumps the car would bounce up and down several times and I would do the same in the seat. The bouncing seemed excessive but I know the suspension was in perfect working order as I saw the receipt myself. All four corners were replaced. Is this ride quality specific to the air suspension cars? I just thought the ride would be much tighter and less Buick-like. Can anyone tell me if the conventional springs on the S420 provide a more planted ride?
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Old Sep 21, 2011 | 03:20 AM
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Originally Posted by nathandimond
Okay chaps,

I just finished from driving a 1997 S500 with 94k miles. It was in mint condition and had impeccable service records. Everything worked beautifully and would seem like the obvious choice out of the three cars I tested today(01 740iL, 01 A8L, 97 S500).

But, I did not care for the ride. The majority of the time, the ride was heaven on wheels. However, when I drove over some sharp bumps the car would bounce up and down several times and I would do the same in the seat. The bouncing seemed excessive but I know the suspension was in perfect working order as I saw the receipt myself. All four corners were replaced. Is this ride quality specific to the air suspension cars? I just thought the ride would be much tighter and less Buick-like. Can anyone tell me if the conventional springs on the S420 provide a more planted ride?
Have you truly ever ridden in a W140 that was in mint condition? What you describe above is a W140 that looks to be in mint but obviously is not. I promoise you if you rode in my W140, it will not do what you describe above. I remember test driving my W140 the first time...I drove it in the Whole Foods parking lot where they had speed bumps. I could swear that the car soaked up those bumps as if there were not there. When I corner hard in my W140, it's level and the suspension rides firm but not harsh, I can push the W140 through a corner with speeds beyond what you might think a 4500 ib car could possibly not handle...and it does it all with grace, speed, and confidence. Truly a ride to experience.

It sounds like this is your first experience in a W140...sorry to see it was not a good one. Keep on looking. You know, if you where close by to where I am...I would pick you up and let you drive my W140...and see for yourself what I mean...I mean it.

Last edited by lcmlee; Sep 21, 2011 at 03:28 AM.
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Old Sep 21, 2011 | 10:42 AM
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Well I appreciate that lcmlee, I think I will keep looking because the rest of the car was perfection. The build quality was unlike anything I have ever come across before. Better than Audi IMO. Last night was my first experience in a W140 and I had a hunch that the bouncy suspension wasn't normal.
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Old Sep 21, 2011 | 11:03 AM
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More than lightly springs were torched,or broken.They the w140 some had trouble with front springs.
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Old Sep 21, 2011 | 07:58 PM
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Originally Posted by lcmlee
Awesome...another 4.2 liter ride. Putting together a W140 Club here...you'll need to attend....with the money you saved...the beer is on you.
A small oil leak, maybe head gasket or oil pan gasket. Are you running synthetic oil?
Synthetic oil it has however no idea what its been having most of its life in terms of oil. Dealer did put synthetic but the records only end at a certain mileage.

From crawling underneath I inspected it to be oil pan/drain plug related. Going to the mechanic on Friday anyways
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Old Sep 21, 2011 | 08:43 PM
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Originally Posted by Benzonline
Synthetic oil it has however no idea what its been having most of its life in terms of oil. Dealer did put synthetic but the records only end at a certain mileage.

From crawling underneath I inspected it to be oil pan/drain plug related. Going to the mechanic on Friday anyways
The sort of problem that most W140 owners would like to have only...enjoy
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Old Sep 23, 2011 | 05:37 PM
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Originally Posted by lcmlee
The sort of problem that most W140 owners would like to have only...enjoy
Leak appeared to be a slight one from the power steering reservoir. Car needs new tie rods soon...otherwise perfect ride.
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Old Sep 23, 2011 | 07:10 PM
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Originally Posted by Benzonline
Leak appeared to be a slight one from the power steering reservoir. Car needs new tie rods soon...otherwise perfect ride.
Good stuff...just normal wear and tear items. Good to hear.
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