cOlDFuSiOn
New member
Been some time since I have been on the forum.. Good to have some time to post again :=):
To sum up a long story, the consumption on my 320d got bad.. really bad.. 10l+/100km average for more than 2 months.. This was on my daily drive to work, varsity and back and mostly town driving.. Full tank of diesel would get me on average 450km a tank ( I know.. I know.. but for us diesel drivers this is horrible..)
I just could not understand it.. Then I also noted that the car would hold its gears longer is normal D mode, persistently revving the engine past 3000.. I started searching and low and behold this seems to be the normal DPF active regeneration procedure (me being new to diesels I was not aware of this..)
Official quote from BMW on the DPF: "The diesel particle filter removes almost all soot particulates from the exhaust, and eliminates them by burning them within the filter. The catalyst layer in the filter means they can regenerate without the need for fuel additives, resulting in better performance than can be achieved with the use of additives.
Additional pressure and temperature sensors in the exhaust channel, a throttle valve in the inlet system and extensive software enhancements in the engine management unit all work together to ensure filter regeneration functions consistently under all driving conditions."
The part in bold is what I do not think is true, because my bad consumption was going on for way too long under my daily drive. (I ruled out bad fuel batches as I filled up at a few stations to test that theory)
But then I also realised the last time I took the car on a long drive was in Jan.. So I took her out for a long drive at some proper speeds and although consumption did not improve immediately on the next tank of diesel things were back to normal (getting 720km on a tank again, average of 7l/100) and been like this for a month again now :thumbs:
So to any others out there who just sit in traffic and do town driving - best take the car for a spirited drive every now and again to help the regeneration..
To sum up a long story, the consumption on my 320d got bad.. really bad.. 10l+/100km average for more than 2 months.. This was on my daily drive to work, varsity and back and mostly town driving.. Full tank of diesel would get me on average 450km a tank ( I know.. I know.. but for us diesel drivers this is horrible..)
I just could not understand it.. Then I also noted that the car would hold its gears longer is normal D mode, persistently revving the engine past 3000.. I started searching and low and behold this seems to be the normal DPF active regeneration procedure (me being new to diesels I was not aware of this..)
Official quote from BMW on the DPF: "The diesel particle filter removes almost all soot particulates from the exhaust, and eliminates them by burning them within the filter. The catalyst layer in the filter means they can regenerate without the need for fuel additives, resulting in better performance than can be achieved with the use of additives.
Additional pressure and temperature sensors in the exhaust channel, a throttle valve in the inlet system and extensive software enhancements in the engine management unit all work together to ensure filter regeneration functions consistently under all driving conditions."
The part in bold is what I do not think is true, because my bad consumption was going on for way too long under my daily drive. (I ruled out bad fuel batches as I filled up at a few stations to test that theory)
But then I also realised the last time I took the car on a long drive was in Jan.. So I took her out for a long drive at some proper speeds and although consumption did not improve immediately on the next tank of diesel things were back to normal (getting 720km on a tank again, average of 7l/100) and been like this for a month again now :thumbs:
So to any others out there who just sit in traffic and do town driving - best take the car for a spirited drive every now and again to help the regeneration..
