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PostPosted: Fri Sep 15, 2017 5:27 pm 
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Joined: Thu Nov 10, 2016 7:36 pm
Posts: 66
Location: Bristol
Car Model: 9-5 1.9tid vector sport estate
Idiot of the week here put 30 litres of Petrol in my tid today. The tank was nearly empty so I brimmed it with diesel and the mix is about 50/50. I did this to an X type Jag some years ago with a Ford 2.2 tdi engine. That one had about 80% petrol in it but as I didn't even realise what I had done I drove it for about 40 miles. It was having EGR troubles at the time. Anyway, my jag man drained the fuel out, flushed the fuel lines, put a new filter on and I did another 30000 miles in that car with no trouble.
A SAAB guy I know is going to pump the fuel out and fit a new filter. He also said, but obviously didn't recommend, that if I put a 100cc's of two stroke oil in it and run it around gradually filling it with diesel and a bit of Two stroke it should be OK. I have already driven it 1 mile to my house.
What does the panel think?
PS Yes I do feel stupid!


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PostPosted: Fri Sep 15, 2017 6:49 pm 
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Light Pressure Turbo

Joined: Sat Aug 11, 2012 7:16 am
Posts: 307
Location: Sunny Aberdoonshire
Car Model: 9-3 TX, 9-5 (Dead) & an ST
Petrol is chemically a 'lighter' fuel than diesel, they are both produced/blended from different feed stocks. You could add a little petrol to lots of diesel without side effects. I would not add a small amount of heavier oil, such as 2 stroke, to a large amount of petrol to make it compatible with a diesel car. You might get away with it but you can damage seals, suffer high levels of knocking etc. Personally I would not do it.


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PostPosted: Fri Sep 15, 2017 8:26 pm 
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Joined: Thu Nov 10, 2016 7:36 pm
Posts: 66
Location: Bristol
Car Model: 9-5 1.9tid vector sport estate
Back in the mists of time I had a Scania 112 (SAAB family) which I took to Russia regularly. There was no Zima (Winter) diesel in those days so it was normal practice to put up to 50 liters of petrol in with 350 liters of diesel to stop it freezing. She knocked a bit but never broke down on me. Then again she didn't have a common rail engine. I loved those diesels, easy to fix and not a computer in sight. I sometimes wonder if main dealers put out scare stories to make money. I read on another forum of a chap who miss fueled his diesel and let the AA dump it outside the main dealer. They changed everything and gave him a bill for upwards of £3000. A lad who worked in a main dealer, not the same one, told him that they all do the same thing. Charge the customer a fortune while all they do is drain the fuel out, clean the fuel lines, put a new filter on and hand it back.


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PostPosted: Fri Sep 15, 2017 8:36 pm 
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Joined: Wed May 12, 2004 9:46 pm
Posts: 13780
Location: Mulbarton,Norfolk
Car Model: TTid's only now :-(
I think the engines are rated for up to 10% petrol....MAX

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PostPosted: Fri Sep 15, 2017 8:57 pm 
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Light Pressure Turbo

Joined: Sat Aug 11, 2012 7:16 am
Posts: 307
Location: Sunny Aberdoonshire
Car Model: 9-3 TX, 9-5 (Dead) & an ST
Petrol is made up of hydrocarbons from about 4 to 12 carbon atoms in a molecule long. Diesel is made up of hydrocarbons from about 10 to 15 carbon atoms in a molecule long. The longer the chain length, the harder it will be to light the fuel, which is knock related. Some engines will be more tolerant than others to incorrect fuelling. The tolerance to incorrect fuelling will depend on many variables, including compression ratio, engine control system etc. Personalty I would not risk mixing fuels above 10%. You might be able to get away with much more, especially on older engines. As they say in the US, "your mileage may vary". I'd risk higher incorrect fuel amounts in an old banger than I would in a car I like :-)

I'm consuming ethanol at the moment and so if what I've typed above sounds like poo then please blame the booze & I'll apologise in the morning. Hic!


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PostPosted: Fri Sep 15, 2017 9:08 pm 
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 38073
Location: SW Herts
Car Model: 9-5 Aero est. 9-3 Carlsson
Our old 2 litre Merc diesel c. 1963 recommended 10% petrol in the diesel in winter. Maybe not so relevant these days.

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PostPosted: Fri Sep 15, 2017 10:15 pm 
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Joined: Thu Sep 13, 2012 8:38 pm
Posts: 1011
Location: West Midlands
Car Model: 2007 Derv Dame Vector Sport
Would that be to stop it freezing rather than for combustion?

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PostPosted: Sat Sep 16, 2017 7:46 am 
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Joined: Thu Nov 10, 2016 7:36 pm
Posts: 66
Location: Bristol
Car Model: 9-5 1.9tid vector sport estate
ericdesmond wrote:
Petrol is made up of hydrocarbons from about 4 to 12 carbon atoms in a molecule long. Diesel is made up of hydrocarbons from about 10 to 15 carbon atoms in a molecule long. The longer the chain length, the harder it will be to light the fuel, which is knock related. Some engines will be more tolerant than others to incorrect fuelling. The tolerance to incorrect fuelling will depend on many variables, including compression ratio, engine control system etc. Personalty I would not risk mixing fuels above 10%. You might be able to get away with much more, especially on older engines. As they say in the US, "your mileage may vary". I'd risk higher incorrect fuel amounts in an old banger than I would in a car I like :-)

I'm consuming ethanol at the moment and so if what I've typed above sounds like poo then please blame the booze & I'll apologise in the morning. Hic!

Sounds very impressive to me.


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PostPosted: Sat Sep 16, 2017 7:55 am 
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Joined: Thu Nov 10, 2016 7:36 pm
Posts: 66
Location: Bristol
Car Model: 9-5 1.9tid vector sport estate
Being ancient, (70!) I have a feeling this may be my last car as I don't do much mileage these days so any damage will only be felt by me. In any case even if I do manage to last for a good few years I should think road tax on oil burners will be so expensive that no one will want it anyway. I also have a 98 MGF with the dread 1.8 engine and they are not owned with the thought of thousands of care free miles! Managed to get it to the south of France and back though! It has already cost me a head gasket.


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PostPosted: Sat Sep 16, 2017 10:12 am 
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Joined: Tue Feb 10, 2015 8:13 pm
Posts: 1021
Location: Peterborough UK
Car Model: 9-5 Aero 2001,1.9TID x 2
Whatever you decide let us know the outcome as you will not be the first or last person to do this.

If it was my own vehicle armed with a few gerry cans I would siphon as much of the fuel out as possible(easy to do via the fuel pump hatch under the rear seat)
with the car on a couple of axle stands.

Brim with diesel and then your dilution factor should be high enough to overcome the problem (maybe 10% petrol at most)
There are more elegant methods but you really dont want to be running the high pressure fuel pump as I believe thats where the damage can be done.


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PostPosted: Sat Sep 16, 2017 2:00 pm 
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Joined: Fri Mar 23, 2007 7:02 pm
Posts: 55
Location: wirral
Car Model: NG 9-5 2.0 tid
Hi working in a main dealers, the reason for replacing complete fuel system for diesels that have been run on petrol is because petrol does not have the lubricating properties of diesel for fuel system components, this can result in metallic particles being distributed throughout. If you have only driven a mile, I would suggest you get a mobile fuel removal van to suck the mixed fuel out, my dad did the same with his 2.2tid.


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PostPosted: Mon Sep 18, 2017 6:20 pm 
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Joined: Thu Nov 10, 2016 7:36 pm
Posts: 66
Location: Bristol
Car Model: 9-5 1.9tid vector sport estate
cjapeterborough wrote:
Whatever you decide let us know the outcome as you will not be the first or last person to do this.

If it was my own vehicle armed with a few gerry cans I would siphon as much of the fuel out as possible(easy to do via the fuel pump hatch under the rear seat)
with the car on a couple of axle stands.

Brim with diesel and then your dilution factor should be high enough to overcome the problem (maybe 10% petrol at most)
There are more elegant methods but you really dont want to be running the high pressure fuel pump as I believe thats where the damage can be done.


What if I put a bit of 2 stroke oil in it for the lubrication? That is what the JAG forums recommend if you are using supermarket diesel.


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PostPosted: Mon Sep 18, 2017 8:08 pm 
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Joined: Tue Feb 10, 2015 8:13 pm
Posts: 1021
Location: Peterborough UK
Car Model: 9-5 Aero 2001,1.9TID x 2
Its your roll of the dice I'm afraid...logically it should help but you wont know until you do it....or not as the case maybe.

Have you looked on the Vauxhall/Fiat/Alfa forums as the Z19DTH engine is very common?

Just had a quick look on Vectra C and consensus there is 5-10% petrol is OK (some add oil too)anything more and you will risk damage to the high pressure pump.....most recommend drain and dilute as above.


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PostPosted: Tue Sep 19, 2017 3:50 pm 
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Joined: Thu Nov 10, 2016 7:36 pm
Posts: 66
Location: Bristol
Car Model: 9-5 1.9tid vector sport estate
Did the sensible thing today and had the fuel siphoned out through the under seat access. Got about 65 litres out and Will pushed the pump tube into all the compartments to get as much out as he could. Put 21 litres of diesel in started it and drove her round to my local filling place where I got another 43 litres in so she was pretty empty. Took her for a run and she seems fine, no EML on and plenty of power. I must have driven it a maximum of 2 miles with the petrol in. We shall see as they say. My SAAB man Will thinks the fuel must have been drained before or it has had a new tank pump as two plastic ties had been fitted as an extra hold down and the bolt that holds everything on had been replaced by a screw. "Looks very AA to me" said Will.
MOT next Tuesday, always something!


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