VAG say not to use Biodiesel in the new CR engines, but apparently its fine to use up to a 5% mix. Now, the other night I had to stop for fuel at Morrisons and whilst filling up with around 3 gallons I noticed in tiny letters on the pump that their diesel is 7% biodiesel, oh bum!

So, is all our diesel like this as obviously Morrisons get the same fuel as anyone else but Ive never noticed the warning on other pumps?

1327143159[/url]' post='2654064']

VAG say not to use Biodiesel in the new CR engines, but apparently its fine to use up to a 5% mix. Now, the other night I had to stop for fuel at Morrisons and whilst filling up with around 3 gallons I noticed in tiny letters on the pump that their diesel is 7% biodiesel, oh bum!

So, is all our diesel like this as obviously Morrisons get the same fuel as anyone else but Ive never noticed the warning on other pumps?

Never thought of this may it clog the dpf ?

Well it might, hence why I asked

they have just changed the laws... it can be up to 10% now...

I dont know why VAG say up to 5% and what parts may be affected, but fiat invented the CR diesel, and I used to put 100% biodiesel in my grande punto sporting on occasion, with no ill effects

10% will be fine

1327146344[/url]' post='2654138']

Well it might, hence why I asked

OK yeah that's the answer I think the bio stuff would theoretically block the DPF system and destroy your warranty we need to look closer at what they are selling in the garages/ forecourt

that may make sence, my fiat never had a DPF, hence no restriction on biofuel...

I think you will find EN950 diesel was changed a couple of year's ago by the government from 5% to 7% bio fuel and DPFs should be fine on them.

Had a quick oogle and cannot see it at the moment

Dempsek is right. Don't worry. Too much bio fuel would cause fuel filter blocking and sticky injectors in the main but 7% won't make any difference other than make your engine cleaner inside and reduce emissions. It's all good!

thanks for that guys, have to say it didnt run quite as economically.... put some shell in today and economy returned.

thanks for that guys, have to say it didnt run quite as economically.... put some shell in today and economy returned.

Yeah...it lowers the calorific value just a tad so you are right about the slightly lower mpg's.

Biodiesel is a win win for DPF vehicles. It has virtually no sulphur content so wont clog your DPF over time with non combustible ash. It burns with less particulates given off and has a higher Cetane rating than regular diesel.Its even better for CR cars as its got much better lubricity for your pump. It does have greater solvent properties so if you have any crud in your system its going to clean it out nicely. Downside is that this cleaning may block your fuel filter sooner than it would but once the crud is gone it wont build up so much again. The calorific value of biodiesel is midway between number 1 and 2 diesel (Kerosene/car diesel) so its not got as much bang for your pennies.

Key issue for biodiesel is whether your car contains seals that are attacked by its solvent properties. Skoda are happy to 5% so I doubt even 10% is going to have any long lasting effect.

Some cars run on 100% biodiesel, especially the tree hugging hippies that make it themselves. I believe this stuff has a lower Cetane rating so they add 2EHN which is the same stuff Millers uses in its Ecomax. A lot depends on exactly what you make the biodiesel out of be it castor oil or whatever.

Edited 22 January, 201214 yr by raisbeck

Biodiesel is a win win for DPF vehicles. It has virtually no sulphur content so wont clog your DPF over time with non combustible ash. It burns with less particulates given off and has a higher Cetane rating than regular diesel.Its even better for CR cars as its got much better lubricity for your pump. It does have greater solvent properties so if you have any crud in your system its going to clean it out nicely. Downside is that this cleaning may block your fuel filter sooner than it would but once the crud is gone it wont build up so much again. The calorific value of biodiesel is midway between number 1 and 2 diesel (Kerosene/car diesel) so its not got as much bang for your pennies.

Key issue for biodiesel is whether your car contains seals that are attacked by its solvent properties. Skoda are happy to 5% so I doubt even 10% is going to have any long lasting effect.

Some cars run on 100% biodiesel, especially the tree hugging hippies that make it themselves. I believe this stuff has a lower Cetane rating so they add 2EHN which is the same stuff Millers uses in its Ecomax. A lot depends on exactly what you make the biodiesel out of be it castor oil or whatever.

this is all informed and good.....

its usually the older cars (before they started mixing 5%) that struggled with the corrosion of seals ect...the newer ones are all fine...

when I used 100% in my fiat it was obtained from bryanD on here at meets, made in a shed somewhere never did any harm, ran very well (and noticably quieter) all that was different is that I needed to use the glowplugs on every start (which normally wasn't ness above 5 celcius!)

the desovlong cruds thing could be an issue if you run it in an old car that has had limited maintinance... as I always put BP ultimate in the fiat to reduce crud, and always got the (expensive) fuel filter changed at the appropriate intervals, i never had a problem