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1987 Porsche 911 Carrera coupe, 1989 BMW 325i, 2001 BMW R1150GS, [SOLD - 1991 Mercedes Benz 350 SDL]
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211 Posts
Discussion Starter #1
I am curious to know what sort of diesel fuel mileage people are getting from their W126 series SD and SDLs.

What kind of diesel fuel are you using (e.g., petrol diesel, Biodiesel B20, B100, etc.)?

Is anyone tracking fuel mileage numbers when using veggie oil?

Thanks.


Sent from my iPad using Autoguide
 

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1985 300SD 1988 560SEC 822 1976 450SEL 1981 300SD
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1,075 Posts
Fuel use..

..city, 11 l/100km, hiway 8l/100km...keeping revs below 3500. I've used all three fuels on a variety of SDs, all OM617A - no difference.
 

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1987 300SDL 114K miles
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31 Posts
Mileage

Mixed driving, freeway (280 on SF Peninsula if you're familiar) sometimes stop-and-go, 5days. Local trips on weekends. I was using B99 until the shop closed: ~23mpg. Now usually B5: 24-25. Best mileage on full dino: 26.5. It's not hard to do a 500 mile tank.
 

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Premium Member
1987 Porsche 911 Carrera coupe, 1989 BMW 325i, 2001 BMW R1150GS, [SOLD - 1991 Mercedes Benz 350 SDL]
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211 Posts
Discussion Starter #5
Mixed driving, freeway (280 on SF Peninsula if you're familiar) sometimes stop-and-go, 5days. Local trips on weekends. I was using B99 until the shop closed: ~23mpg. Now usually B5: 24-25. Best mileage on full dino: 26.5. It's not hard to do a 500 mile tank.
Naysaypa: I did the SF to SJ commute for seven years on a 280 and 101, so I am very familiar with those roads. :) I almost bought a 80s turbo diesel Benz for that commute, but ended up buying a 2000 Volvo V70R AWD wagon/estate, which was a fine commute sled for the money. I am ready to buy another Benz turbo diesel. :)

Richard
 

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Premium Member
1987 Porsche 911 Carrera coupe, 1989 BMW 325i, 2001 BMW R1150GS, [SOLD - 1991 Mercedes Benz 350 SDL]
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211 Posts
Discussion Starter #6
81126, naysaypa, JoeBob55: Thanks for sharing your experiences on this topic. Your feedback is very helpful. Thanks for mentioning your model, year, and engine. Mileage on your current engine is helpful too. Cheers!

Richard
 

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1979 280SL, 1984 280SL
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5,654 Posts
I'm getting a solid 27mpg or better. My '91 350SD has a fresh 3.0 OM603, using the 3.5's IP and turbo.
 

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Premium Member
1987 Porsche 911 Carrera coupe, 1989 BMW 325i, 2001 BMW R1150GS, [SOLD - 1991 Mercedes Benz 350 SDL]
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211 Posts
Discussion Starter #9
I'm getting a solid 27mpg or better. My '91 350SD has a fresh 3.0 OM603, using the 3.5's IP and turbo.
ChiefRider: 27 MPG is nice! I imagine the fresh 3.0 OM603 helps a lot.


Sd: 30mpg hiwy, local minus 3
Sdl: 25mpg hiwy, local minus 3
Fuel: used to be dino now wvo. Wvo smoother, smells better but slightly weaker.
SDLCrazier: What year is your SD?
 

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from small to large
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my sd was an 82. it was rear ended in 2003 and totaled.

a side note: are you a diy type person? if not, you realize that relying indie shops for all repair work will burn big holes in your pockets. those are nearly 25-30 year old cars, although engine runs strong in most cases, there will always be here and there to fix. i hope you are, otherwise a toyota may not be a bad idea. no offense.
 

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Premium Member
1987 Porsche 911 Carrera coupe, 1989 BMW 325i, 2001 BMW R1150GS, [SOLD - 1991 Mercedes Benz 350 SDL]
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211 Posts
Discussion Starter #11
my sd was an 82. it was rear ended in 2003 and totaled.

a side note: are you a diy type person? if not, you realize that relying indie shops for all repair work will burn big holes in your pockets. those are nearly 25-30 year old cars, although engine runs strong in most cases, there will always be here and there to fix. i hope you are, otherwise a toyota may not be a bad idea. no offense.
SDLCrazier: Thanks for sharing the year of your SD. I understand that pre-86 SDs have a different engine (OM617) then the and 86-87 SDLs (OM603). Are the interiors or features of the cars that different, besides the extra leg room in the rear seat area of the SDLs?

I do a bit of DIY on my '87 Carrera now and did some on my old '81 300D (e.g., adjusted the valves, replaced switches, etc). Is there more that this with the 80s SDs? I don't have a desire or skill to rebuild the engine or transmission. I'd outsource work like that to a pro. Hopefully I wouldn't need to replace the engine, but I do know the transmissions need rebuilding at some point.

Feedback appreciated. :)
 

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81-85 SDs are basically the same, 86-87 SDL are the same. between these two generations, the list of differences is (collection of my memory):

SD vs. SDL:

Engine:
5 cylinders <-> 6 cylinders
intake manifold is at passenger side <-> at driver side with crossover
valve adjustment manually <-> hydraulic auto
prime pump <-> does not need prime
aux belt adjustment manually <->auto adjust
engine sound louder <-> much quieter
less power <-> more power
engine block steel <->alloy
mpg higher <-> lower
airfilter housing supports prone to break <->sits at side never break
easier for DIY <-> harder

Interior:
no airbag <-> has steering wheel airbag
shorter leg room <-> longer
sound system quality lower (becker 540) <->nicer (becker 780)

Exterior:
shorter body <-> longer body
recessed headlight lens <-> flat with lens wiper
waved mud skirt <-> flat mud skirt

Overall SDL is finer and nicer.
 

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Premium Member
1986 420SEL/1995 E300D/4 BMW’s/2 Vanagon’s
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1,026 Posts
I get about 27 mpg mixed driving in my 86 300sdl. I use a shot of Optilube diesel fuel treatment when I fill up.
 

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1987 300SDL
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10 Posts
MPG

1987 300 SDL, 200K. Owned the car for 1 1/2 years now. In town 22-23 mpg. Highway at 72-75 mph 24+, best ever was high 25+. I'll have to say it is the most consistent mpg vehicle I have ever owned. Don't really figure it hardly now it is so repeatable. Mostly run what we have in Illinois which has bio in it. Run #2 in Missouri and it seems to do a bit better.

I kept reading about the people getting 27-30 all the time before
we bought ours hoping for the same. Don't know how they do it unless they drive 55 mph? Steve
 

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1986 420SEL/1995 E300D/4 BMW’s/2 Vanagon’s
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1,026 Posts
I track my mpg with an iPhone app that I basically record miles driven and fill up amounts so I am relying on that accuracy (I suppose it could be off). I also have brand new injectors and use a diesel additive so that may help. According to January/February 2012 issue of MBCA Star magazine, the factory numbers are 22/31. FWIW, I also track my 420SEL and over 2 years I have average about 18mpg. Both of them seem to be right in ranged for mixed driving.
 

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Premium Member
1987 Porsche 911 Carrera coupe, 1989 BMW 325i, 2001 BMW R1150GS, [SOLD - 1991 Mercedes Benz 350 SDL]
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211 Posts
Discussion Starter #17
I kept reading about the people getting 27-30 all the time before we bought ours hoping for the same. Don't know how they do it unless they drive 55 mph? Steve
From what I've read so far online in the forums, the cars that are running well (tuned up) and use a diesel additive seem to get the best mileage.

Once I get my next diesel MB I'll post here too.
 

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1986 mercedes SDL
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27 Posts
SDL mileage

we are getting 28 mpg total. i try to keep is under 3000 rpms no mater what. this is at 90 degree temperature. i will be curious to see how the fall is since its cooler here in boston!
 

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1979 280SL, 1984 280SL
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5,654 Posts
I am not easy on my diesel, accelerating briskly from a stop, and frequently pushing it on the highway. I have never done less than 26 mpg, calculated by miles between fills, using the same pump.
 

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current: 08 GL320 CDI, 05 ML 350, 98 E300, 84 300SD,
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494 Posts
Spot on

I am on my 5th tank. 31.04 mpg best. averaged 29mpg-30 overall
This after valve adjust, purge, air/fuel filter tune, new h20 and belts. Oil lines
Rotella 5w-40 syn oil. Alda CCW 1/8.
Super tech 2-stroke 200:1, with Power Service diesel additive. Makes engine a little quieter. 159k
3.07:1 rear and 195 x14" Bundts
Reads about 3000 at 65 and 3500 at 75mph, I think? Speedo spot on by GPS
And, it will do a 100.:bowdown:
Not too shabby for an almost 30yr car
 
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