8 hours ago, chimaera said:

 If you don't want to go to that effort, you could get a bottle of Millers Diesel Power Ecomax and add several shots of it to the tank - leave it a few hours to mix through the fuel in the tank. It includes lubricity enhancers and would probably counteract the effect of the petrol, but I don't really know how much would be needed.

 The tank is full so no mixing will take place even with the diesel returned from the filter when running. The idea is to add before starting to fill as the incoming fuel will circulate the additive with the fuel in the tank. You could wait all month and it will still not mix from just adding it to the tank.

Please note - I am not a mechanic or expert in anything.

 

It could be added at top-ups, it's 1ml per litre but can be used at double dose.  There's no information about its dispersal but Millers Oils is in West Yorkshire and can be rang (or emailed) for technical assistance and talk to an actual person. - https://www.millersoils.co.uk/wp-content/uploads/2019/12/6204-Diesel-Power-Ecomax-Multi-Shot.pdf

 

Even when the tank is full is it really full and if so does the additive just sit on the top, I don't know.  If I remember I'll ring Millers Oil next week (of course what ever answer I give here some one/people will say I didn't speak to a technical person, or I've got it wrong or misunderstood (both possible) or that I'm making it up to cover my stupidity or for sake of my vanity, such is the internet).

 

ETA: thinking about it (me 'ead 'urts now) how would you know how much to add until you've finished and the pump tells you how much it's delivered.

 

Edited 5 November, 20223 yr by nta16
ETA:

Had a MK2 1.9TDI and put 10 lites of unleaded petrol in by mistake. filled tank with diesel as you did, a mate told me to use a liquid called CEBO which was added to the tank 1 litre, again topped the tank up after using this liquid, the car at the time was 4 years old with 20.000 miles on the clock, we did another 78.000 -- total 98,000 and 8 years later no issues what so ever , car was written off by a unisured driver my friend bought the whole car off us and fiited the engine in his, that enginr has now covered a otal of 132.000 miles and does not use any oil and still goes like stink so bear that in mind, ps the liquid CEBO cost at the time £12.95 for 1 litre, worked for me 

2 hours ago, KeithCheetham said:

 The tank is full so no mixing will take place even with the diesel returned from the filter when running. The idea is to add before starting to fill as the incoming fuel will circulate the additive with the fuel in the tank. You could wait all month and it will still not mix from just adding it to the tank.

If it's left for a few hours it'll diffuse through the tank contents just fine, no stirring needed. Basic mass transfer.

11 minutes ago, chimaera said:

If it's left for a few hours it'll diffuse through the tank contents just fine, no stirring needed. Basic mass transfer.

 

It won't even take that long, since both liquids are completely miscible, mixing will happen immediately during the fuelling process. 

Please note - I am not a mechanic or expert in anything.

 

Bear in mind this is added after the tank was filled, the fuelling process had been completed, how much additive will cling to the side of the filler pipe/tube/neck and how long will it take to transit to the tank.  (A fluids engineer would know this from his mental slide rules / tables / reference books.)

 

I've sent an email to Millers Oils as I'll forget to ring them until I remember possibly weeks or months later, I wonder if an office cleaning person will send me a definitive reply.

 

Also bear in mind I've also suggested using nothing more than diesel but perhaps topping up sooner and in dribs and drabs, of course that could add to the cost if the diesel is sold at a higher price than the usual fill up (every week/day/month/whenever).

 

25 minutes ago, sepulchrave said:

 

It won't even take that long, since both liquids are completely miscible, mixing will happen immediately during the fuelling process. 

This is about chucking in the additive on top of an alteady full tank to mitigate the petrol's lower lubricity. You won't get the mixing effect of fuel sloshing in, you're depending entirely on diffusion which will take a little time.

25 minutes ago, chimaera said:

This is about chucking in the additive on top of an alteady full tank to mitigate the petrol's lower lubricity. You won't get the mixing effect of fuel sloshing in, you're depending entirely on diffusion which will take a little time.

 

Fairy nuff, but they're still perfectly miscible fluids so mixing will happen quickly, just jump in the car and drive, honestly so much armchair overthinking going on in here!

From what I understand some fuel additives have lubricating properties which could reduce wear/damage to the high pressure fuel pump, that may be a viable option

Just checked on amazon, mannol do a diesel ester additive which claims to improve lubricating properties of the fuel and reduce wear on injectors and high pressure fuel pump. Also would just like to add that I am not a professional mechanic just an amateur so you may want to run this suggestion by someone with more expertise.

Please note - I am not a mechanic or expert in anything.

 

On 05/11/2022 at 23:11, nta16 said:

I've sent an email to Millers Oils as I'll forget to ring them until I remember possibly weeks or months later, I wonder if an office cleaning person will send me a definitive reply.

 

This morning I had a reply from the email I sent to Millers Oils Technical at 5 to midnight Saturday.   I asked if it mattered if the additive is added to the fuel after the fuel station pump delivery has finished and the vehicle’s fuel tank is full.

 

The reply. -

"The short answer is no, putting the treatment in before just aides with the mixing but you can do it after. When you drive the car the fuel will slosh in the tank and mix it that way.

 

Hope this helps."

 

 

Please note - I am not a mechanic or expert in anything.

 

@fabia88 my wife's previous car was a diesel which, as with the Fabia, I rarely drove but a couple of times I filled the tank and used Shell V-Power diesel (or whatever it was called then) and I was impressed with the effect, cloud of silver grey smoke instead of cloud of dense black smoke and particles when booting it off a roundabout to clear the sh1te out of it.

 

I recommend using a couple of consecutive tankfulls (not just a couple of consecutive top-ups) every now and then (at least?) and particularly before and after a service and before and at a MoT.

 

There's also BP Ultimate diesel and may be others but I've only tried Shell and my wife was only keen on low priced fuels then.

 

Particularly with a diesel it's noticeable that the cleaner air and fuel is going into the engine the (relative) cleaner it (appears) at the tailpipe, so you also want to keep on top of air filter changes and cleaning the MAF sensor and changing the engine oil and filter in a timely fashion using good quality oil and filter.

 

Just my views and experience as a driver/cyclist/pedestrian of 45 years.

 

UPDATE 

 

Firstly thanks for all the great advice and replies. 
 

I took the Fabia out for a drive today, it’s been sat on the drive all weekend, iv done about 15 miles and all seems fine. It’s starting fine, revs are sitting at the right level and it sounds no different at all! 
 

soon is it does a few more miles il get more diesel in and dilute the petrol down some more. 
 

Touch wood, it’s all okay so far
 

 

Few more miles put on the clock today.

 

The little Fabia isn’t too keen on

starting when the engines warm, takes a couple key turns. Starts fine from cold. It’s still driving fine / normal engine temps. 
 

crammed in 5L of diesel in the way home, slow and steady dilution.

So you've decided against something like the Millers Diesel Power ECOMAX (Multi Shot) then, personally (and I know others here have reverse and other opinion or belief about this) I think adding it in now and after/regular use, at least until the bottle is empty, would be a good belt and braces move for now and future use, particularly on a 14 year old diesel that may not get many blow-out runs.

 

I'm sure your wife would be happy to buy the bottle as a low cost remedy for her mistake and as a reminder to prevent making the same mistake again. 😊  But it's you and/or your wife's money and decision of course and I don't want to start a marital dispute or divorce proceedings, just wanting you to get £400 out of those tyres. 😁 

  

https://www.millersoils.co.uk/products/diesel-power-ecomax/