Getting the best MPG on an E320 CDI
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Junior Member
Joined: Jan 2008
Posts: 16
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From: Kentucky
'06 E320 CDI, NAV/HK Sound/Xenons/KeylessGo, '05 997 Carrera cabrio, '08 R320 CDI.
Getting the best MPG on an E320 CDI
Could'nt find much when I searched, and thought it might be a good thread to start to get all of you diesel fanatics discussing what fuel economy you are getting (good and bad) and how this is being achieved.
I had a 2005 E320 CDI for 3 years and did 70% highway/30% city and got 31-33/gallon - 33 soon after an oil service in summer, ~31 in winter. My newer 2006 E320 CDI is getting me ~ 27/gallon for the same drive!
I had a 2005 E320 CDI for 3 years and did 70% highway/30% city and got 31-33/gallon - 33 soon after an oil service in summer, ~31 in winter. My newer 2006 E320 CDI is getting me ~ 27/gallon for the same drive!
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Joined: May 2007
Posts: 1,252
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From: Blaine, WA
07 E320 Bluetec
My 07 Bluetec has been giving me 33-34 summer and 32 winter for a 70h/30c long daily commute.
On stock 16" rims and tires (mpg may change when I upgrade to 18" staggered
)
On stock 16" rims and tires (mpg may change when I upgrade to 18" staggered
)
Last edited by pinebaron; Feb 12, 2008 at 06:42 PM.
Junior Member
Joined: Feb 2004
Posts: 64
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From: Chicago area
'06 E320 CDI,premium package, xenons,LED's,Nav. and '11 BMW 335 D, Nav, Sport, Premium, Cold, PDC
E320 CDI mileage
I have 2006 E320 CDI w/ 31K miles.
In a summer I’m getting ~30MPG w/ 70% highway and rest in a city.
My summer wheels are staggered 18” w/ 245 and 265 tires.
This winter I’m getting ~28 MPG w/ winter tires on factory 16” wheels.
We have very cold and snowy winter this year in Chicago.
In a summer I’m getting ~30MPG w/ 70% highway and rest in a city.
My summer wheels are staggered 18” w/ 245 and 265 tires.
This winter I’m getting ~28 MPG w/ winter tires on factory 16” wheels.
We have very cold and snowy winter this year in Chicago.
Junior Member
Joined: Jul 2007
Posts: 31
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From: DC
2005 E320 CDI (Brilliant Silver)
Member
Joined: Jun 2005
Posts: 101
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From: Lake Goodwin, WA
2005 E320 CDI, 1999 ML430
Super Member
Joined: Jun 2004
Posts: 996
Likes: 16
From: Tampa, Florida
2017 E300W
https://mbworld.org/forums/e-class-w211/246667-e320-cdi-mileage.html
Why did you get rid of the '05?
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Joined: Jun 2008
Posts: 44
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From: Denmark
Mercedes-Benz 2006 W211 E320 CDI Avantgarde stationwagon
I'm managing to get around 33-35 with around 110-120 km/h - and the cruice control should help getting a very smooth drive and saving fuel 
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Senior Member
Joined: Apr 2006
Posts: 436
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From: Barrington IL
2015 E 250, 1999 BMW M Roadster, 1939 International Harvester, 2023 GLC
I believe oil makes a difference. Dealer & others are likely to put in wrong oil since there are not many CDI's and reading the manual is something they rather not do, nor is bringing in 7 Qt's of the right stuff. They figure most owners would not know or care so pump in whatever they have. It will be good oil, a synthetic no doubt but perhaps a 10-40 or something like this.
Manual spells out a very specific oil grade and weight. I am now running 0-30 w. Diesels are most efficeint hot so any start up cold condition (summer weather included), a lighter oil will help.
Recently had mine at a very well know local european car independent shop. I purposely left the manual on the front seat with the oil page marked with a post-it. Pick up the car and the paperwork says 15-40 syntec. I did one road trip with the 15-40 and my MPG was off the norm. Took it back and had them put in the elf 0-30. Dealer owned up to the mistake. MPG improved
From now in I'll bring in my own oil
Manual spells out a very specific oil grade and weight. I am now running 0-30 w. Diesels are most efficeint hot so any start up cold condition (summer weather included), a lighter oil will help.
Recently had mine at a very well know local european car independent shop. I purposely left the manual on the front seat with the oil page marked with a post-it. Pick up the car and the paperwork says 15-40 syntec. I did one road trip with the 15-40 and my MPG was off the norm. Took it back and had them put in the elf 0-30. Dealer owned up to the mistake. MPG improved
From now in I'll bring in my own oil
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