SEC1939

Cold weather impacts the CDI MPG's no doubt. I noticed my 05 CDI MPG less than usual for a midwset winter. Glanced at my water temp indicator and it was much cooler than normal perhaps around 60c after an hour + of running. Not that the gage is super accurate but it was less than what I was used to seeing. Guy on this board said the T-stat for some reason goes bad on the CDI more than others E's.

Anyhow, Dealer put new one in under warranty part alone was over $100. Back to normal now. I'll hit the road today to see how MPG's have hopefully improved

jditom

I have a scan guage II on mine at all times and it reads water temp to 1 degree along with 12 other parameters

99E320_Bilal

how is the 2006 model in this matter ?

michakaveli

Same engine...

99E320_Bilal

I don't know if I am having the same problem with my car. I curruntly getting around 9.0-10.5 litres/100km. Should I have mine checked out, if i have the same problem ?

Diesel Benz

At least something wrong with the car unless you are all the time crawling at a city jam.

How does your engine temperature read?

SEC1939

I would only add that winter blend diesel fuel has koroseen or some thinner in it. This effects your MPG's a bit as well. Summer blend on a hot summer day gives me the best results. Toss in a tail wind and watch out

99E320_Bilal

car's not driven hard, I do hear some weird sounds upon starting it up after a while, and the engine has gotten louder. I think I should make a appointment with Mercedes-Benz ASAP to have it checked out.
I got the upgraded warranty package for my car, I hope they will cover me.

Silly_me

Running much colder here with an 05 CDI, not sure the exact temp (above 60 below 80c) and I'm averaging 30mpg U.S.

SEC1939

I'd say your thermostat is shot, Should run above 80 under 120 about 1/2 way. Expensive part over $100