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  #1  
Old 05-04-2009, 04:16 PM
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Tips for fuel economy, 300D.

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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  #2  
Old 05-04-2009, 04:36 PM
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What about a synthetic differential oil in the rear end??
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  #3  
Old 05-04-2009, 04:55 PM
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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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  #4  
Old 05-04-2009, 05:06 PM
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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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  #5  
Old 05-04-2009, 08:32 PM
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[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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  #6  
Old 05-04-2009, 09:00 PM
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Injectors and IP timing within specs.
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  #7  
Old 05-04-2009, 09:29 PM
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As an MB driver I can't be bothered by such things as MPG.
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  #8  
Old 05-04-2009, 11:05 PM
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Quote:
Originally Posted by Diesel911 View Post
Injectors and IP timing within specs.
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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  #9  
Old 05-05-2009, 03:36 AM
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Quote:
Originally Posted by pawoSD View Post
10w30 will do more harm than good to the engine
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.
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  #10  
Old 05-05-2009, 06:58 AM
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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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  #11  
Old 05-05-2009, 08:50 AM
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Quote:
Originally Posted by t walgamuth View Post
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.
Also in the pretty easy catagory is slightly larger tires . . . as long as you have the room . . .
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  #12  
Old 05-05-2009, 09:29 AM
Don't touch the ornament
 
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A little Diesel Kleen at every fill up.
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  #13  
Old 05-05-2009, 09:47 AM
ForcedInduction
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Originally Posted by pwagon View Post
A little Diesel Kleen at every fill up.
...will cost more than the little bit of fuel saved.
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  #14  
Old 05-05-2009, 11:55 AM
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Quote:
Originally Posted by bart_dood View Post
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?


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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  #15  
Old 05-05-2009, 01:52 PM
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Quote:
Originally Posted by ForcedInduction View Post
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.
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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