See I happen to go to a manufacturer in Manchester that sells additives to the fuel manufacturers. They sell amongst other things an invisible dye that has a distinct signature, that signature is unique to each manufacturer. They also do a test kit.
So Shell for example can go to one of their outlets, "buy" a litre of fuel and see if the outlet is actually selling their expensive fuel or a cheap copy.

Great if a customer says I filled up with your brand of fuel and it ruined my engine - just dip the tank.

Remember a few years ago when a certain supermarket was adding lots of biodiesel to their fuel and a lot of Vauxhalls died - really easy to say where the fuel came from. Tangiers Orange - gone, missing her
Replaced by Ewok what a mistake - now a happy Disco Sport owner

Bobupndown wrote:

Used Millers and Redex occasionally and not noticed any difference at all. My car usually runs on Tesco diesel with the odd premium drink if I need fuel when not near a Tesco branch. Again no difference noticed in performance, economy or noise.
As previous posts, regular servicing, quality engine oil and regular fuel filter changes keep it running nicely

I've been following a company called SulNOX for a while now (started by ex-world champion motorcycle racer Jim Redman and now run by his son Jimmy) and they produce a commercially available product called ElimiNOX ( https://eliminox.co.uk/index.php/products/fuel-conditioner ) which is claimed to not only remove the water and Diesel bug from your fuel tank, but also improve your MPG and reduce the NOx emissions. It's particularly recommended for vehicles older than 10 years old and classic cars. It cost about £38 per 500ml which works out about £2.30 per tankful of diesel.

Has anyone on this forum tried this product and if so, what are the results? -------------------------------------------------------------
1965 Series IIa Safari LWB White - gone
1982 RR 2 door Sahara dust - gone
2000 Freelander 1 3 door white gold - gone
1995 Discovery 1 200Tdi Biaritz Blue - gone
2009 FL2 TD4 HSE Stornoway Grey

I am in the camp of change the oil & filter, every six months what ever mileage you do, and change out the fuel filter every two years, i also twice a year drop a bottle of this into the tank spring and winter.

As i have two diesel cars FL2 and an R40 i buy the 5 pack offer.

https://www.ebay.co.uk/itm/321013523280

Two bottle pack.
https://www.ebay.co.uk/itm/373657168527

We have used miller’s in various diesil motor over the years not for cure but in hope of prevention. We tended to use it if doing a long run /journey thinking if everything was up to temperature etc it would work better. No idea as i am no mechanic, just trying to prevent problems.

I use a monthly dose of Comma Diesel Magic, to help keep the injectors clean.
Been using it for years on diesel's. Hyundai Ioniq 5 Ultimate. The family car.
2009 Rimini Red SE TD4. Gone.
2006 Tonga Green i6 HSE. Gone.
Audi A5 convertible, my daily driver.
1972 Hillman Avenger GT, the project.

Hi
I had a Freelander 1 TD4, got when it was 2 years old with 20,000 miles on the clock, sold it this year with 190,000 miles on the clock. Always added 2 stroke oil when filling the tank. In all the years i had the car i had no issues with injectors and car never needed oil topping up between services. So i intend to do the same with my FL2 although my starting mileage is higher at 138,000.

One day i called at the local car parts dealer on the way home for a bottle of 2 stroke oil, i was on my Suzuki bike.
The lad on the counter asked if that was my bike, "yes" i said, he replied " its a 4 stroke you don't need to add oil" I said "i know, the 2 stroke oil is for my Landrover" "f*** me, i did'nt know Landrovers had 2 stroke engines" he replied.

Another vote for the 2 stroke camp. Not sure it does any good, but again not sure it doesn't. Does not cost a lot so what is to lose.

2SO

Used it for years in my diesels Jules