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Old 06-15-2008, 11:27 AM
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Location: Southeast
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How much mpg does a 300sdl give, really?

Someone has an ad up on Craigslist. He says he gets 26 city/38 hwy. I don't know how a heavier 6 cylinder (they are 6, aren't they?) 300sdl can get more mpg than my 300d 5 cylinder with turbo.

What are you guys getting in REAL mpg city/hwy? I figured they'd give about 28 on the hwy.


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Old 06-15-2008, 11:34 AM
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Originally Posted by jbach36 View Post
300sdl can get more mpg than my 300d 5 cylinder with turbo.
They are two completely different generations of engines. The 6-cylinder used in that car is much more efficient than the one your 300D.
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Old 06-15-2008, 11:48 AM
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Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,373
The OM603 6=cyl engine engine uses a cross ventilated air intake for less restriction and has different cylinder rings so they use less oil (and less blowby). There is also the better aerodynamics on the 124 chassis but even the big 126 chassis with greater frontal area is an improvement over the 123 brick shaped body.
I dispute the claim that the SDL will give 38 MPG however, thats stretching things a bit unless its measured downhill with a tail wind. 26/28 MPG is more like it. maybe the seller meant 26/28 but then again there's always the sales factor (to sell it, tell them what they want to hear!)
If you want good diesel fuel economy get a 190D with a 5 speed transmission! That combo is going to get you closer to 38 MPG maybe more
'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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Old 06-15-2008, 11:59 AM
Join Date: May 2002
Location: Blue Point, NY
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The '86 gets 28-29 like a clock. Runs 90% highway. Speeds are 65-70 typically. Cannot get 30 mpg unless speed is kept below 65 and a/c is not used.
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Old 06-15-2008, 12:00 PM
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Location: portsmouth nh-point pleasant nj
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i consistently get 28-29.5 with mixed driving no A/C and a mere 418000 miles on the ole gurl
commercial fisherman diesel in my blood in my boats trucks and Dear old Dad has had me drivin them since i got my first license in 1968
1986 300 SDL 427654
1999 Chevy Crew Cab Dually 225423
1986 300 SDL 287000 Dad's
1987 190 Turbo 158000 Mom's (my inheritance)
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Old 06-15-2008, 12:15 PM
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Ghost of Diesels Past
Join Date: Oct 2005
Posts: 13,285
some guy on my CL is claiming his 190D 2.2 gets 45 mpg.. city.. But he wants 700 for it and its in good shape...

and it sold already
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Old 06-15-2008, 04:38 PM
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Join Date: Nov 2002
Location: Milford, CT
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Mileage claims with these old cars are like fishing stories, don't beleive everything you hear and read.

Figure low 20's around town, high 20's on the open road, maybe breaking 30 on good days if you drive slow without the AC.
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200
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Old 06-15-2008, 06:26 PM
compress ignite's Avatar
Drone aspiring to Serfdom
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
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What, Would Stalin do?

'Have Beria strangle or shoot them.

$700.00 U.S. for a nice running 2.2 190D ain't bad... (Rust?)
(I've heard of 5sp models getting close to 40mpg on the highway,at reasonable
'84 300SD sold
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Old 06-15-2008, 08:19 PM
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Location: Valle Crucis, NC
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In two years of ownership, all types of driving, all types of lead-footing or non-lead-footing, I've never seen lower than 21 or higher than 26.5 in mine.

~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


1987 300SDL
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Old 06-15-2008, 09:19 PM
LUVMBDiesels's Avatar
Dead on balls accurate...
Join Date: Aug 2006
Location: Red Lion,Pa
Posts: 2,207
In my four months of owing a 1986 SDL with at least 290K miles. I have averaged 27.6mpg in mixed highway and city traffic. My best tank was 36mpg on straight highway running at 65mph. My worst was 24.something

I average 27+ doing 75mph up I 81 and I 78.

So far I have put 10,000 miles on it runnign between West Virgina and NY so I think my averages are pretty accurate.
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf 86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad
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Old 06-15-2008, 09:30 PM
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When I had one,with mixed driving I saw 22 mpg to 25mpg.
On my 1993 300SD 3.5 liter nothing better than 24mpg.
1993 300sd 294k (km's)
Toronto,Ont Canada
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Old 06-15-2008, 09:37 PM
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Join Date: Aug 2005
Location: Buford, GA
Posts: 438
I just got back from my first road trip in my 86 and averaged 25.9 running B100 with 80% highway at 75 cruise and A/C. Considering that B100 is usually about 10% less mileage, that would make it 28 or so.
87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100
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Old 06-15-2008, 09:55 PM
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Location: Nova Scotia, Canada
Posts: 136
Originally Posted by captainmonk View Post
i consistently get 28-29.5 with mixed driving no A/C and a mere 418000 miles on the ole gurl

Wow. 418k! That's a few hours on it. Imagine how many rotations the crank has made in that time.

So, at almost half a million miles, and being a Mercedes, it must be due for it's first tune-up then.
Does it still get 60mpg?
1991 GMC Sonoma Ext Cab w/Isuzu diesel (converted March Mar 2003) - sold
1994 S10 Ext Cab w/Isuzu diesel (converted Mar 2008)
1998 Toyota Sienna XLE

1994 S10 with Isuzu diesel and 5spd
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Old 06-15-2008, 11:10 PM
1986 300sdl 1985 380se
Join Date: Aug 2005
Location: West Monroe LA
Posts: 484
In town 24-26 mpg. On the highway at 70-75 mph 27 mpg. Keep her at 65 mph and I have seen 28-29mpg with the A/C on.
This is a 86 sdl with 110,000 miles.
1986 300sdl
1985 380se
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Old 06-16-2008, 01:06 AM
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Join Date: May 2007
Location: Jacksonville, Florida
Posts: 102
Commute 54 miles each way and mileage is dead on 28mpg.

I use my bike 2 to 3 days a week and she gives me 48mpg and is alot more fun and a whole lot faster.

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