Right to the point..

On very cold weather ( -10 ) do we need to put anything in the tank together with diesel?

The dealer suggested 2-3 litres of unleaded gas per fill up.
A guy from a repair-shop suggested to add a special additive.
And the guy in the gas station said that there is no need for any of those and that the diesel they sell is good to up to -17.

Point of notice. Here is Greece and diesel cars are not so common.

Does it really that cold in Greece??!

Sorry, I'm afraid I don't know the answer though...although I thought putting any unleaded in a diesel was a definite no.

Listen to the garage diesel is fine up till -17*c. For piece of mind you can get approved additives that lower the freezing point futher. I definatly don't recommend using unleaded petrol as it will cause it to smoke rather badly.

Jim-Armao said:

The dealer suggested 2-3 litres of unleaded gas per fill up.

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I remember my grandad telling me about this when he used to drive waggons years ago that they used to put unleaded in diesel to stop it from freezing.
I wouldn't put any in a modern car though, if you live in a region that gets that cold i'm sure that they wouldn't supply a product that isn't up to the job. Does it really get that cold

Get that advice from the Dealer in writing, and have it countersigned by a witness before you even think of following it. Putting any amount of unleaded fuel into a common rail diesel will most likely cause it to stop, and then you will need a full strip down and clean of the whole engine and fuel system. Very very expencive.

If you are expecting temperatures below -15 I'd consider investing in a diesel tank pre-heater.

Thank you all for the replies.

Where I live it is quite common to get up to -3 to -5 for a couple of days during the winter. The coldest I have seen is -11 but that is like once every 10 years.

But, I go skiing on a mountain nearby and there temperatures can easily drop to below -10. The lowest I have seen there was something like -32.

I guess I will keep an additive in hand in case I go skiing and it is that cold.

I have run diesel cars for years without a problem, down to -11 on one day. The problem with trucks is that their fuel tank can be exposed on 4 sides allow the cold to bite deep.

I have heard that most fuel companies put their own additive in winter diesel to stop waxing.

I have run diesel cars for years without a problem, down to -11 on one day. The problem with trucks is that their fuel tank can be exposed on 4 sides allow the cold to bite deep.

I have heard that most fuel companies put their own additive in winter diesel to stop waxing.

Well, in the UK there is a British Standard for diesel fuel.
Its OK to minus 7c in summer and minus 15c in Winter.
So UK motorists need to add nothing.

I would ask garages/ fuel suppliers in Greece, whatever you do dont add petrol, that can wreck the fuel pumps and potentially cost £2,500.
( or any other additive without Fiats approval)

Diesel will be made volatile enough for the conditions.