My GFs 98 e300 is running low mpg city. About 21mpg city and she drives very, very conservative. The car doesn't shift over 2500rpm when she drives. The car is supposed to do at least 25 city I thought. it has 260k, no fuel leaks good filters. I maintain the car well. My 99 does 24-25 city..

any ideas?

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Tires? Alignment? Brakes dragging? 4mpg difference is a small enough gap that it could simply be down to driving habits. Constant throttle vs a hunting throttle can net you 3-4mpg right there. So even though she's driving slow, if she's feathering the throttle, out goes your mpg right there. Torque converter locking up properly? FWIW, I average 23-24mpg in my SDL, I'd expect the W210 to do better.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

i did a trip in philly a couple weeks back (all city driving) and found my mileage around 23, which i thought was low

__________________
0o==o0

James 4:8

"...let us put aside the blindness of mind of those who can conceive of nothing higher than what is known through the senses"
-Saint Gregory Palamas, ---Discourse on the Holy Transfiguration of Our Lord God and Savior Jesus Christ


Centrally located in North East Central Pa.

yeah as far as I know the trans was replaced a few years back. the alignment is out, I did the toe on it but didn't do caster or camber and I did put two calipers on it cause it sat for awhile before I got it like two years. she goes thru a lot of stop and go on her commute to work. red light to red light and she babies back into the gas and keeps it steady.

23 isn't too bad depends on your throttle.. I remember hearing your car run, it had that little clack to it for a few seconds on startup.. usually when the injectors start leaking and the nozzles are old, they get more clack. might be why you're running little bit lower than my car. my car has had 3 sets of injectors .. how's that gold e320 running?

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

LOL I've done 17mpg in the E300D driving around San Francisco.

__________________
CENSORED due to not family friendly words

worn out injectors? conventional wisdom says they're due for a rebuild every 100k miles or so.

clogged intake manifold? 260k miles of ccv and egr can make for a constricted sludged up intake.

dry wheel bearings? the front bearings in particular seem to need replacing on these cars about every 150k miles. brand new w210 front bearings/hubs come with a tiny blob of grease in them, i always repack them before installing, using only the neon snot colored genuine mb bearing grease, it's excellent.

__________________
1998 E300 turbodiesel

America's Rights and Freedoms Are Not The Enemy!

Use Kreen 500 miles before your next oil change, I did that both in my tank and engine on my OM606. I just can't brag enough about Kreen, the injector knock were gone and the oil (drained) came out like gooey tar.

__________________
06 MB E320 CDI 123k miles
14 Sienna (wife's DD) 36k miles
11 GL350 Bluetec 136k (Sold)
96 E300; 292k+ miles (Donated)
11 Sprinter 22K+ miles (Sold)

that's awful. What did you spend like multiple hours idling in traffic?

cleaned that intake after I did the glow plugs. restored a lot of power. maybe the injectors do leak or something. I put used ones in it. I bought it with misfiring cylinders from lazy injectors. wheel bearings feel tight and wheel slides nice and easy.

keen? that stuff worries me putting in your oil. I'd be afraid it washes stuff away it isn't supposed to. if your car came out gooey and tarry that tells me your car has missed a lot of oil changes

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Nope all oil change done around 7.5k usually Rotella Synthetic but the car had almost 300k miles. Your gas mileage would increase too.

__________________
06 MB E320 CDI 123k miles
14 Sienna (wife's DD) 36k miles
11 GL350 Bluetec 136k (Sold)
96 E300; 292k+ miles (Donated)
11 Sprinter 22K+ miles (Sold)

hmmm interesting. I'll have to give it a shot but it scares me. if it's such a strong detergent, Id worry it would wash away bearing surfaces etc. Mobil 1 synthetic cured my noisy lifters on my daily driver.. I had a nice tick when I got the car and 0w40 fixed it after 4k

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

OP mileages sounds about right for a diesel. Very high if your car is a gasser.

__________________
[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.

To eliminate driving techniques, swap cars for a month.

__________________
NOW: 2017 C43 AMG, 2006 Wrangler Unlimited Rubicon, 1966 230SL, 1980 450SL (for sale!)
PAST: 2006 C230, 1997 E300D, 1994 E420, 1994 Neon Spt Cpe, 1984 300ZX, 1983 Celica GT, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175, 1978 Suzuki DS100
www.mbca.org - www.sl113.org - www.ohio4x4.com

Yes x2

__________________

FWIW our average mpg on the 98 E300 is 26.5. Best tankful I every got (all highway) was 30.6. And everything is in perfect working order. So there's nothing unusual about low 20's for all city driving.

Not sure where you got the impression of at least 25 city. There some people who boast of 35-38 highway on these cars...I just don't believe it.

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Big problem with oil change chemicals is the oil cooler and associated hardware keeps a percentage in the motor...

Best practice is change oil regularly...

Leave the chemicals on the shelf.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!