Over here, in 'cold' weather (more like a spring day for you!!) lorry drivers used to add about 25% paraffin to their diesel to prevent waxing of the diesel at low temperatures - you can smell it if you follow the lorry - it's a bit like the TVO smell . . . . lovely. I have never come across adding petrol to diesel though - but in theory the petrol would certainly ignite at diesel compression, and help ignite the diesel, or warm the combustion chamber. The only thing that worries me is if the petrol ignites 'earlier' than the diesel so producing increased stress on the piston crown. Perhaps the only way to find out, is to try it, but by adding say, 5%, then 10%, then 15% then 20% then 25% petrol, until better starting is obtained - that way you don't add any more petrol than is absolutely necessary, and you minimise the risk of damaging your engine. Nice idea though, thanks for posting it - is there a fuel engineer out there who can add more information on this one??
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