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1972 280se 4.5 w108 and 1984 280sel w126 euro
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41 Posts
Discussion Starter #1
I just got a 1984 280sel euro w129. At 72mph my rpm is at 3500-3600. I guess I only have a 4 speed transmission with my m110 engine. Can anyone confirm this. I get 17-18 mile per gallon average. My manual says there was 4 speed and 5 speed models but I don't think its the original manual. My car starts in 1st gear from a stop.

Dan
 

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1,648 Posts
A W129 is a SL, you have a W126.
As for the W126 automatics - they are all the same box. Gear changes were done at the differential.
 

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Registered
1972 280se 4.5 w108 and 1984 280sel w126 euro
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41 Posts
Discussion Starter #3
Yes. I have a w126. My iphone typed the wrong number. Anyway, what do you mean about the differential? Is my transmission not shifting into 5th or do I not have a fifth gear? I wish I had for those high rpms on the highway.

thanks for your help.

Dan
 

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SuperModerator
1986/1990 W126
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14,137 Posts
Apparently those 6's are happy to rev like that forever and its all normal. Theres been a couple of people pop up before wondering if there was some fault but it seems its designed like that.
 

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1972 280se 4.5 w108 and 1984 280sel w126 euro
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41 Posts
Discussion Starter #8
Thanks for the responses. What kind of gas mileage should I expect? I am getting around 17mpg. How can I improve that or is that normal? Also, any suggestions as to what spark plugs, distributor cap, rotor and wires I should use for my m110 engine? And do you guys get like a harmonic humming noise around 65-70 mph? Also, I am interested in changing my odometer back to the classic speedometer. Is it hard to get the dash out. My clock doesn't work either.

Thanks!

Dan
 

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Registered
1984 280SE, 2009 SL550
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497 Posts
Thanks for the responses. What kind of gas mileage should I expect? I am getting around 17mpg. How can I improve that or is that normal? Also, any suggestions as to what spark plugs, distributor cap, rotor and wires I should use for my m110 engine? And do you guys get like a harmonic humming noise around 65-70 mph? Also, I am interested in changing my odometer back to the classic speedometer. Is it hard to get the dash out. My clock doesn't work either.

Thanks!

Dan
Dan, I found that the folks with the most expertise on the M110's are on the W123 board. (No offense to anyone here). More of those cars (at least in the States) have this engine than the 126. Not sure where you are - you might want to update your profile.

Cheers,
David
 
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