E320 cdi mpg (om642)

[Frontstep]

Wind from a different direction,traffic, uphill,weight on board,quality of fuel,tyre pressures etc, there's quite a few things before you start getting technical.

 

[onefortheroad]

Thanks. The rears are 265/35 18 (unecessarily wide IMO) fronts 245/40 18

Should be 275 35 18 . mine is anyways ?

 

[matthew k]

That's what's on them, I know, the wheels will be refurbished soon! So maybe 40 mpg @ 70 mph is OK? That's 72 on the speedo

 

[AMGeed]

Should be 275 35 18 . mine is anyways ?

Cls tyres are wider than W211 E class tyres.
265x35xR18 is the correct size for his E class.

 

[V6Matty]

I normally manage to average 46 on my run from Newark to Birmingham and back but today I actually got 51, no real difference apart from filling up the last couple of tanks from a place in the A46 called harvest fuel, essentially bio diesel so im going to monitor over a couple more tanks and see if was just a fluke

 

[matthew k]

I normally manage to average 46 on my run from Newark to Birmingham and back but today I actually got 51, no real difference apart from filling up the last couple of tanks from a place in the A46 called harvest fuel, essentially bio diesel so im going to monitor over a couple more tanks and see if was just a fluke

Is yours an estate? Mine seems thirsty TBH,

 

[V6Matty]

Yep estate so never quite as good as saloon,

 

[Lord_Lucan]

Same engine but in a W204 C Class saloon and I'm averaging 36.47mpg over 13k miles (70% A/B Roads, 30% Town driving: not able to use cruise often though)

 

[Botus]

I normally manage to average 46 on my run from Newark to Birmingham and back but today I actually got 51, no real difference apart from filling up the last couple of tanks from a place in the A46 called harvest fuel, essentially bio diesel so im going to monitor over a couple more tanks and see if was just a fluke

don't use this exclusively, it's bad for the engine,

Bio gums up the piston rings and the pistons get too hot and if you keep using they melt all over the bores (with associated drop in power ).
Plus and I don't get why, Bio breaks glow plugs. I guess some how the way it burns set up shockwaves that the modern one can't cope with.

It will seem smoother, till it gives up and it may clean stuff up for a bit hence the current improvement

the gist of the story is run decent stuff from Esso, Shell or BP, the rest is an alleged short tern win... which actually results in no car at the end.... and No I don't have an axe to grind, if you want to prove my point please keep using and report back about how it all went wrong and let us know about your new car. I give it less than 20k miles and or less than 12 months

 

[V6Matty]

don't use this exclusively, it's bad for the engine,

Bio gums up the piston rings and the pistons get too hot and if you keep using they melt all over the bores (with associated drop in power ).
Plus and I don't get why, Bio breaks glow plugs. I guess some how the way it burns set up shockwaves that the modern one can't cope with.

It will seem smoother, till it gives up and it may clean stuff up for a bit hence the current improvement

the gist of the story is run decent stuff from Esso, Shell or BP, the rest is an alleged short tern win... which actually results in no car at the end.... and No I don't have an axe to grind, if you want to prove my point please keep using and report back about how it all went wrong and let us know about your new car. I give it less than 20k miles and or less than 12 months

Don't worry I've done a little digging and it's not a full fat bio diesel, turns out only about 20% is actually bio so probably not the same issues, that said I do fill up where I can so it tends to split between Shell, texaco and now this harvest fuels,

 

[Botus]

Don't worry I've done a little digging and it's not a full fat bio diesel, turns out only about 20% is actually bio so probably not the same issues, that said I do fill up where I can so it tends to split between Shell, texaco and now this harvest fuels,

yes, and that's exactly what did two sets of glow plugs on mate at work's car, stopped using it and 2 years later they haven't gone pop

 

[Aripeka]

Is yours an estate, what size are the rear wheels?

Saloon. Running on Continental ContiSport Contact 5. 245/45 R17 99Y.

 

[Larkone]

My OM642 improved when I changed the breather pipe from the rocker box to the inlet Y-piece. The diaphragm in the old one had gone hard. It ticked over more smoothly, improved pulling power and if I didn't use the performance added a couple of mpg. The later breather pipes have an improved design - better sealing where it joins the y-pipe. Only takes 5 minutes to swap out.

 

[Lord_Lucan]

My OM642 improved when I changed the breather pipe from the rocker box to the inlet Y-piece. The diaphragm in the old one had gone hard. It ticked over more smoothly, improved pulling power and if I didn't use the performance added a couple of mpg. The later breather pipes have an improved design - better sealing where it joins the y-pipe. Only takes 5 minutes to swap out.

Interesting...do you happen to know the part number for the later model breather by any chance?

 

[Craiglxviii]

Interesting...do you happen to know the part number for the later model breather by any chance?

Something I'd also be interested in..........

 

[Lord_Lucan]

Something I'd also be interested in..........

Great minds and all that jazz

 

[Larkone]

Interesting...do you happen to know the part number for the later model breather by any chance?

Bought mine from here:
https://www.ebay.co.uk/itm/Separate...357268?hash=item33f053d254:g:IToAAOSw-0xYSYlK

New type is identified by the improved red seal at the y-pipe end.

 

[Lord_Lucan]

Ahh I see...mine has the red seal on already.

 

[Wighty]

Bought mine from here:
https://www.ebay.co.uk/itm/Separate...357268?hash=item33f053d254:g:IToAAOSw-0xYSYlK

New type is identified by the improved red seal at the y-pipe end.

I bourght one off them the other month , it's still in the bag in the boot at the moment . I'm doing a test at the moment with a catch tank to collect the sludge from the pcv . I'll carry the new one around incase I get a problem with my catch tank creation

 

[Craiglxviii]

Bought mine from here:
https://www.ebay.co.uk/itm/Separate...357268?hash=item33f053d254:g:IToAAOSw-0xYSYlK

New type is identified by the improved red seal at the y-pipe end.

Bought!