[Watsey]

I've use Miller's Oils in recent months - helps with smooth running but I'm not sure it has much in the way of cleaning properties.

Suspecting it's injector-related I'm currently running Archoil 6400-D - the dosing is one 430ml bottle to a tank of fuel.

I'm already noticing improvements : smoother running and the rattle is decreasing rapidly, even after a couple of gallons. The combustion sounds a lot less metallic. The nay-sayers will always claim "placebo !" but I've been driving with the media system switched off for period each day so I know what I'm listening for.

I'll let you know what I think, either way, once the entire tank of fuel-Aerchoil mix has been used.

[HighlandPete]

Originally Posted by Watsey

Suspecting it's injector-related I'm currently running Archoil 6400-D - the dosing is one 430ml bottle to a tank of fuel.

I'm already noticing improvements : smoother running and the rattle is decreasing rapidly, even after a couple of gallons. The combustion sounds a lot less metallic. The nay-sayers will always claim "placebo !" but I've been driving with the media system switched off for period each day so I know what I'm listening for.

I'll let you know what I think, either way, once the entire tank of fuel-Aerchoil mix has been used.

With the high pressures and injection strategy of current injection systems it is even more critical to have clean injectors, (perfect spray patterns). I'm of the opinion most users don't have any idea of how important deposit control additives are for optimum injection performance, smooth and efficient running.

I was in a local car hire office the other day and noticed the guy had Forte diesel injector cleaner on the shelf. I asked him why. His answer was something like "it is one of the simplest ways to sort out poor engine running". Hire cars typically use the cheapest fuels and over time the injectors need a clean up.

The fact BMW now offer their own approved petrol and diesel cleaning additive, indicates to me they are playing catch up. Injection equipment manufacturers (Delphi, Stanadyne, Lucas, etc.), have been there for years.

Look forward to reading your results.

[Alscoob]

Originally Posted by Watsey

I've use Miller's Oils in recent months - helps with smooth running but I'm not sure it has much in the way of cleaning properties.

Suspecting it's injector-related I'm currently running Archoil 6400-D - the dosing is one 430ml bottle to a tank of fuel.

I'm already noticing improvements : smoother running and the rattle is decreasing rapidly, even after a couple of gallons. The combustion sounds a lot less metallic. The nay-sayers will always claim "placebo !" but I've been driving with the media system switched off for period each day so I know what I'm listening for.

I'll let you know what I think, either way, once the entire tank of fuel-Aerchoil mix has been used.

Well I've just had a bottle delivered, so lets see what it does, just need to use up most of a full tank first before i put it in. Let's hope it's a fix otherwise 335i is the option!! (best not tell the wife I have a test drive on Wednesday !!)

[dobbo99]

out of interest, my issue is not the EGR valve apparently, and is to do with a leak in the exhaust, and something else (not declared as yet)
BMW had the car on Friday, and still have it.

Im pleased that there is a fault, so it wasnt just in my head

[Daftasabrush]

Originally Posted by dobbo99

out of interest, my issue is not the EGR valve apparently, and is to do with a leak in the exhaust, and something else (not declared as yet)
BMW had the car on Friday, and still have it.

Im pleased that there is a fault, so it wasnt just in my head

This now makes me wonder if mine had issues too, too late to find out now!

[Alscoob]

Originally Posted by dobbo99

out of interest, my issue is not the EGR valve apparently, and is to do with a leak in the exhaust, and something else (not declared as yet)
BMW had the car on Friday, and still have it.

Im pleased that there is a fault, so it wasnt just in my head

Now that's interesting... I'm to BMW tomorrow to take the Tech guy for a spin to see what they say. Will up date

[asif03]

Originally Posted by dobbo99

out of interest, my issue is not the EGR valve apparently, and is to do with a leak in the exhaust, and something else (not declared as yet)
BMW had the car on Friday, and still have it.

Im pleased that there is a fault, so it wasnt just in my head

Very interesting. I thought mine had a bit of a loud noise at a certain amount of load but then thought maybe it's just me coming from a petrol. When you put your foot down a little more it goes away as you've mentioned. Mine's only got 800 miles on it though so could it be similar?

Also would you guys say using Millers diesel additives on a new engine like mine is beneficial? Even if just to reduce noise a little?

[JOHNBMWM5]

Originally Posted by asif03

Also would you guys say using Millers diesel additives on a new engine like mine is beneficial? Even if just to reduce noise a little?

I would NOT use any additives in your new Engine.

[dobbo99]

Ok so I had a leaking exhaust, one of the gaskets wasnt sealed properly (not sure yet if it's been altered since new, or which gasket?) AND there apparently is a corrugated pipe running to EGR valve which had split and was causing the valve not to function properly.

Will get car back tomorrow, so see if it runs differently.

I've had a 320d on loan, and that drives how an auto diesel is supposed to so I'm hoping for big improvement.

[Alscoob]

Well visit to dealer, for tech guy to listen to car while I drove to demonstrate noise, was inconclusive. He admitted there was an odd noise but didn't think it was that loud to be serious.

I made the mistake of saying that previously I had used Tesco diesel and have recently filled up with BP Ultimate. Basically they didn't think it was that loud and suggested that I just monitor it to see how it goes after a couple of tankfuls of branded fuel. The Tech guy did say he would do some research to see what BMW thought, but I wont hold my breath!

So I'm going to give it 3 weeks and see what happens.

[dobbo99]

Used all weekend, its definitely smoother from inside the cabin, but Im not sure the clattery noise has disappeared so I guess thats here to stay.
The diesel fumes smell has gone though, so thats good!

[Alscoob]

Originally Posted by dobbo99

Used all weekend, its definitely smoother from inside the cabin, but Im not sure the clattery noise has disappeared so I guess thats here to stay.
The diesel fumes smell has gone though, so thats good!

Good to hear that all is well for you now

[Watsey]

My experience having run a bottle of Archoil 6400-D through the system followed by a tank of untreated fuel :

- engine is performing well and although it's entirely based on feel (no facts) it seems to pull better. Maybe the injectors and fuel system have had a good clean.

- little/no improvement in the rattle around 1800rpm under light load. It's either an annoying characteristic of this engine series or something for the dealer at the next service (~1500 miles to go).

I'm currently running BP Ultimate Diesel with no additives but may go back to Millers Oils to see if that reduces the noise.

[mikeoz]

Reading this with intrested. .
What's every ones opinions on best cleaner?

Redex
Millers
Archoil
Etc?

[pdk42]

Every N57-engined car I've been in, or driven, has displayed the same characteristic of clatter on light throttle load. I'm not convinced that any of the additives or choice of fuel makes any significant difference. It's just the way the engine works and it gets worse as the engine ages. Try an Audi 3.0 diesel and there's none of this noise. It's there on the 5, 6 and 7 series too, but the improved sound insulation masks it better.

[TodmordenLad]

Originally Posted by pdk42

Every N57-engined car I've been in, or driven, has displayed the same characteristic of clatter on light throttle load. I'm not convinced that any of the additives or choice of fuel makes any significant difference. It's just the way the engine works and it gets worse as the engine ages. Try an Audi 3.0 diesel and there's none of this noise. It's there on the 5, 6 and 7 series too, but the improved sound insulation masks it better.

Agreed.

My F11 530d was whisper quiet on the move, which my F31 330d certainly isn't.

For me, it's a big flaw in an otherwise great package, which may well sway me to go for a 5 next time around

[Alscoob]

Originally Posted by mikeoz

Reading this with intrested. .
What's every ones opinions on best cleaner?

Redex
Millers
Archoil
Etc?

Can't say for the others but have just run a tank of fuel with Archoil through the car and can echo Watsey's comments above.

[pdk42]

Originally Posted by TodmordenLad

Agreed.

My F11 530d was whisper quiet on the move, which my F31 330d certainly isn't.

For me, it's a big flaw in an otherwise great package, which may well sway me to go for a 5 next time around

Yes, I agree and it came as a bit of a shock for me since I too moved from an f11 330d to an f31 330d. I eventually swapped for a 335i and the aural experience is so much better.

[kiwifiz]

Well 200 ml's on from a dose of Archoil 6400-D and my experience mirrors Watseys......ultimately no change to low load clatter. Looks like Pdk42's experience pretty much sums it up. I've used premium fuel from getting my 330d at 7000 mls to it's current 29000 so there's no preventive silver bullet in doing that. Slightly depressing that the apparent trend is for worsening with age as this car is a keeper for at least another couple of years. I miss my relatively silent car in all driving modes (not just floored!) that I had from 7000 to 19000 ml before onset

[Alscoob]

Originally Posted by kiwifiz

Well 200 ml's on from a dose of Archoil 6400-D and my experience mirrors Watseys......ultimately no change to low load clatter. Looks like Pdk42's experience pretty much sums it up. I've used premium fuel from getting my 330d at 7000 mls to it's current 29000 so there's no preventive silver bullet in doing that. Slightly depressing that the apparent trend is for worsening with age as this car is a keeper for at least another couple of years. I miss my relatively silent car in all driving modes (not just floored!) that I had from 7000 to 19000 ml before onset

Well I do think the additive has had some effect and does seem slightly smoother, but having sampled the smell of petrol again , I'm just going to turn the volume up on the HK and await a change in the next 6 months...or as soon as the man maths can justify it

[4rtex]

Could any one correct me if I'm wrong in saying that some sort of inlet port cleaning like walnut media blasting would help cure the issue in this thread?

(I know, I know it's an old post...

[SW6Steve]

Listen to a Land Rover defender and BMWs sound like silk