On Fri, 01 Jan 2010 22:45:50 +0000, Mas Dubh wrote:

My understanding is the diesels ability to pass through the fuel filter
is the issue.

Mainly down to the wax particles clogging the filter rather than the
viscosity. Though some where between 5 and 10C below the cloud point
the fuel becomes a gel and won't flow.

Also any entrained water will form ice in the pipes and clog fuel flow.

Water and oil don't mix I'd expect any water to stay in the bottom of
the tank and freeze there. Of course if you run the tank low the
sloshing about may enable the water to get into the fuel lines. I
don't feel that a tank with a reasonable amount of fuel in will slosh
as much as one nearly empty.

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.

I'd prefer paraffin to petrol as well. Even have a few hundred litres
out back, trouble is the beggers mark it now like red diesel. B-(
One site I found said to add two stroke oil if adding more than 20%
(IIRC) paraffin for the lubrication reason, not so much the rings but
the pump and injectors.

--
Cheers Dave.
Nr Garrigill, Cumbria. 421m ASL.