"Mas Dubh" wrote in message
...

My understanding is the diesels ability to pass through the fuel filter is
the issue. Also any entrained water will form ice in the pipes and clog
fuel flow. I changed the filter believing it to be the problem initially -
it was manky right enough - but given the non flowing diesel it was IMO
less of problem than the temps. I also added a cetane booster to try to
assist combustion / free up the flow. If I was to comingle the fuel my
choice would be parrafin - a couple of pints only per tank. Purely to
prevent any chance of washing oil off piston rings.
Sorry this is getting off the purely weather subject.

-12C. When I was in construction, we kept an eye on the forecasts during
winter, and anything approaching -12C had us running for the additives and
hot air blowers. However, if there is any water in the system, that figure
becomes a myth. Additives added by the fuel companies should provide
protection well below -20C. But again, notice the myth comment. And fuel
bought on the south coast probably won't offer enough protection in
Scotland. If you're travelling to colder climates, buy locally when you get
there.

And as Mas says, paraffin is to be preferred, since it is a lot safer. And a
road side check by Customs & Excise is going to prompt for some very awkward
questions if they find evidence of petrol in a diesel system. It is a fairly
common ploy to try and remove traces of red (un-taxed) diesel.

As a final resort if all else has failed, spray ether (or WD40) straight
into the air intake as you crank the engine over. DO NOT USE in conjunction
with glow plugs (let them cool off for 20 minutes), since very expensive
damage can be caused. Thick gloves and no beards are recommended!!! :-) I am
not joking.

jim Northampton