Just wondered if there were any things I'd missed on my car to improve fuel economy. So Far:

Pump up tires 35-40psi
Fresh valve adjust
New air filter
Fix fuel leaks

I'm thinking of switching my oil over to 10W30 and using honda manual transmission oil in the diff as it seems to be designed towards low viscous drag.

Anything else I've missed?

I notice some people fiddle with their ALDA's for performance, is it possible to adjust it for economy?

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Current Rides:

2004 BMW R1150GS Adventure
2005 MB W211 E320 Cdi

What about a synthetic differential oil in the rear end??

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Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....

You have done all the right things. If it is so easy then the manufacturers would have done it at the factory. Don't they all want to be seen of having good fuel economy? In other words, after market gadgets probably would not work.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

Use proper synthetic differential oil. 75w90

10w30 will do more harm than good to the engine, use a proper diesel oil. Like 5w40 Mobil 1 or Shell Rotella Synthetic. The most gains in mpg will come from driving style, keeping the engine's valves adjusted and so on.....

Put a good synthetic transmission fluid in too.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

[QUOTE=pawoSD;2191876] The most gains in mpg will come from driving style, keeping the engine's valves adjusted and so on...../QUOTE]
X2...........I was able to get 32+ with my 82CD keeping the speed to 35mph,coasting as much as possible, and elimnating quick starts.....
of course those behind me were not happy

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

Injectors and IP timing within specs.

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84 300D, 82 Volvo 244Gl Diesel

As an MB driver I can't be bothered by such things as MPG.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)

x2 on this one.

replacing old injectors is one of the best "bolt on" fuel economy boosters. (by old i mean over 100,000 miles on them) you can always take yours to a shop to check out the spray pattern. in my case they pretty much all pee'd out fuel..

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Yep. That oil isn't made to handle the special needs of Diesels. Soot will make it turn acidic and abrasive since it doesn't have additives to disperse it. It also doesn't have as much zinc, which is harmful to g@ssers catalytic converters, to reduce wear.

Use a good 5W40 synthetic formulated for diesels.

The only cost effective way to significantly increase economy after altering your driving and making sure the car is tuned properly is either introducing an od transmission or putting in a taller gear ratio in the rear end.

The od tranny is tough to find for a 123 but the diff is pretty easy.

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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.

Also in the pretty easy catagory is slightly larger tires . . . as long as you have the room . . .

A little Diesel Kleen at every fill up.

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85 300D 180k

...will cost more than the little bit of fuel saved.

i've heard hyperinflating the tires could work i think somewhere in the 50-60 psi range idk havent tried it but once.

Switching to 0w30 would prolly work vw has since done that to all they're diesels and they're about the same configuration lil higher reving but still.

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2004 Infiniti G35 3.5L 6mt Coupe 73K miles 25.6mpg ytd
2001 Green Audi TT 225 AWD Roadster 71K 6sp 30.9mpg >>STOLEN<<
1982 300D Turbo 231K 120hp? 28.1mpg YTD

Thanks, I'll keep my eye out for some 5W40 for diesels, my car isn't due for an oil change for some time yet so I have a while.

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Current Rides:

2004 BMW R1150GS Adventure
2005 MB W211 E320 Cdi