For my '85 300td, I'm at close to 3,000. Maybe 2,750 or so.

Just seems kinda high. Is something screwed up, or is this normal? None of the W123s have overdrive, do they?

What do other cars cruise at?

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1995 E320 (2009 - current)
1985 300TD Turbo black (2007-current)
1983 300TD Turbo red (2008-2009)
1972 280SE (2004-2007)
1977 300CD (2003-2004)
1976 240D (1999-2003)

No infact you have a 2.88 rear end making it lower than normal for the 3.07ers . The 85 is most efficient at 75mph btw, drive your car like it was meant to be (laws be damned).

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Yep, be thankful you've got the '85. You're turning about 2750 at 65 mph.........everybody else is closer to 3K.

Yess, I have an 85. I guess this explains why I was still climbing when i had to back off at 105mph!

The car also has 119k on it though

Hi everyone,

This is something I've also wondered about. Does anyone know what it would be for a '79 300D non-turbo? (Not all of us have a tach ) I believe it has a 3.46 rear end.

Thanks for the info and this great forum!

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1979 300D 184k Km

It seems like my 78 300D revs at about 3500 at 75.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes

You care should be someplace around 3300 rpm at 65 mph.

0 at all speeds........

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

I have an 84 300cd-t. does that mean i have a 3.07 Diff? What is the lowest ratio diff available to fit my car? it just seems like it can be a lot more efficient than it is. i have often wondered why these things are geared to rev so high at relatively low speeds. what kind of difference does a 5-speed make? is that the only option?

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coupes are cooler than sedans
84 300cd-t 305k
84 caddilac eldorado 43k
87 shelby GLHS 84k
86 dodge daytona shelby 112k
77 buick lesaber sc 74k
all coupes

2.65 gets me a nice 3000RPM at exactly 75. Really helps with the noise and fuel economy. The road noise is louder than the engine at 75.

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Dale

http://i52.photobucket.com/albums/g1...MG_2277sig.jpg

1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel

Chugs right along at about 2500rpm with the 2.47 rear on my 300TD... gotta love that TC slip.

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99 E300 Turbodiesel 100k

I guess my E300D has the same differential as that's what I get or about 2600 RPM @ 65 MPH. My TDI has an even lower ratio and it spins at about 2100 RPM when going 65. Generally the best fuel economy is achieved at 50-60 MPH.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

You must get PHENOMENAL fuel mileage!

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

Yeah, it leaks about a gallon a month.

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

I'm at like the usual 2750 for 65 mph and at 75 its probably at 3200 ish..It doesn't roar but it is noticeable.. I need a hood pad, that would quiet it down