Well I traveled 1075 km, and it took 80L Mostly highway.

If my calcualtions are correct that is 31.6MPG US.

My secret, 2.24 rear gears, standard trans, and stock alda settings.

I will be switching to 2.47 gears when I get a chance.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

Did you have the odometer correctly calibrated for that rear end?

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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.

all measured with garmin gps

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

30 MPG,

921.6 km, 72.129L
572.6 Mi, 19.05 Gal

More city driving than the first tank.


Clutch holding up very well thus far, very fun to drive.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

the SEC is moderately more aerodynamic than the SD... it may help a bit.
2.24 wow. with a clutch... I am worried about the 3.07 in my 82D... can't wait though.
I would think once you stop flooring it, you will get upwards of 36MPG. that combo should REALLY get good mileage.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I've got the perfect SEC to convert if someone else is interested.......
Mercedes clearance sale:

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'83 240D (for sale)
'84 Harley FXRT
'85 300CD Turbo (Sold)
'85 500SEC (for sale)
'04 Dodge Dakota Quad
'06 Harley FLHTCI
'97 SL320

Hey Icefire...This sounds interesting. Couple of questions: How bad is the difference in acceleration with the 2,24 rear (in comparison to 3,07)? Noticeable, but not too severe, or... What kind of rpms are you seeing on highway (say at 100kmh). Price of diesel went up over here at the beginning of the year - it now costs 1,40 euro/l (about 8 USD a gallon), so I am looking for ways to keep on Benzin'

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1983 300SD, 1999 200 cdi and 1998 1,6 (gasser)

Acceleration below 20 km/h is quite slow, definitly noticable, above its as fast as any 300 SD. economical(2600rpm) shift points are 2nd gear 30kph, 3rd gear 60kph, 4th 90kph,

At 100 kph, my RPM is exactly 1900, i have not traveled any faster than 140 KPH because of the strict speeding laws.

With an auto trans I think a 2.24 might be livable, with a manual, I will probably change to 2.47, for a small improvment around town.

will report back next week. with another mpg figure.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

Excellent. I've been looking for a differential and seen plenty of 2.24s but have thought that it would be too drastic a change... I am doing about 28-29 mpg right now, but with these fuel prices a bit more would be great... Thanks!

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1983 300SD, 1999 200 cdi and 1998 1,6 (gasser)

A six speed would be the berries. You could take off easily and get the ultra overdrive too.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I wonder what it would take to put a ZF6 from a corvette ZR1 in... I have one in my garage...

A transaxle? Probably a redesign of the whole rear half of the car.

Has anybody tried modifying the undercarriage to decrease drag? I've noticed the newer MBs seem to have a lot of attention to this area.

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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles

How did that work out? I'm guessing the diesel engine fit pretty easily into an engine bay that was designed for a big V8.

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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles

A W126 has an identical engine bay to a C126, so the engine side of the swap was very very easy, Wiring for the diesel includes, water temp, oil pressure and glow plugs thats it, The Alternator is off the M117 with the pulley changed so its an 80 amp unit.

The driverside engine shock is in the wrong location, it is currently unconnected, I may change that and weld a small braket in the proper location.

The only difficulites I had with the swap, were in regards to a manual trans, I had to get a custom made pilot bearing, custom make the shift rods, Driveshaft was custom as well, same thing with speedo cluster.

I had the flywheel balanced but they did a **** job, I asked them to balance it to the flex plate, and they said that it was "close enough" to neutral balance. I certainly wont be going back to that machine shop unfortunatly there are only 2 shops within 100 miles that balance flywheels.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D