Redex Diesel System Cleaner

P3

My 2009 diesel (non dpf, short journey) has done 77k miles. It has failed emission MOT once when I didn't get my car hot.

Since then, I get on the motorway 20mins before my MOT and it has passed with flying colour.

I just saw it on offer for £2 (250ml)

Should I get it?

I have never used it before.

Does it have to used in full tank? Due to COVID, a full tank would take me a whole year.

Will half tank fuel okay? Do I pour it in before or after fueling up?

JustAnotherSaver

I've used Redex before. Never noticed a difference.

Millers Diesel Power Ecomax on the other hand, I actually did notice an increase in MPG at least.

IIRC you add it to 40ltrs minimum. I just chuck it in with a fill up.

VFR

Fill the tank with either BP Ultima or Shell V Max a week before going for your MOT and again a high rev run (like you do on the motorway) just before.

AdrianC

Big on homeopathy, are you?

250ml into 50 litres is 200:1, 0.5%

Here's the MSDS for it, which tells you what's in it.
http://www.farnell.com/datasheets/1634748.pdf

It's "60-100%" (or about 93-98%, if you go by the other ingredient %ages), "Naphtha (petroleum), hydrotreated heavy". What is that? Well, if you google either of the EC or CAS numbers, which are statutory identifiers... it's paraffin, white spirit. You're welcome to pay £8/litre for that if you wish...

Now, why is your fuel system - the fuel pump, pipes, injectors - dirty in the first place, since it has nothing but solvent going down it all the time?

mobileron

Forte is the one the trade use.

AdrianC

mobileron said:

Forte is the one the trade use.

Because they get a nice commission on it and point-of-sale materials...

MSDS:
https://www.forte-nwe.pl/wp-content/uploads/2015/07/J44911-Diesel-Injector-Treatment-E01.00-EN.pdf

Oooh, it's a lot more complex than the Redex one.
So what is it... 50-75%... yep, white spirit again.

HansOndabush

VFR said:

Fill the tank with either BP Ultima or Shell V Max a week before going for your MOT and again a high rev run (like you do on the motorway) just before.

If your car is not designed for that fuel, then you can actually get worse MoT emissions than using regular fuel that most engines are designed for and will burn more efficiently. Only high performance cars need high spec fuel.

fred246

White spirit is good for cleaning things.

BOWFER

I'm sceptical about additives, but one I did read very good reviews for is ARCHOIL AR6400 D-MAX pro diesel DPF cleaner.
It's not cheap, it's +£20 for 400ML.
I've got a bottle in the garage for if/when the wife's Evoque DPF displays a light.

AdrianC

BOWFER said:

I'm sceptical about additives, but one I did read very good reviews for is ARCHOIL AR6400 D-MAX pro diesel DPF cleaner.
It's not cheap, it's +£20 for 400ML.
I've got a bottle in the garage for if/when the wife's Evoque DPF displays a light.

https://www.thedieselgarage.com/attachments/sds-20ar6400-20nl-en-pdf.36025/

40-45% kerosene
30-50% a curing agent for epoxy adhesives
20-25% a petrol product

And for that, they charge £50/litre.

David713

fred246 said:

White spirit is good for cleaning things.

So is hot soapy water but I wouldn't put that in my fuel tank.