If you're driving up and back in the same day, you're unlikely to encounter issues as daytime temperatures rarely drop below zero.

If you're staying overnight, it is definitely a concern - One which i've experienced before! (Spending hours waiting for the temperature to rise and the diesel in the lines to warm up is a pain!)

Essentially, diesel fuel has wax in it which will crystallize at cold temperatures and block your fuel pump filter and sometimes even the fuel lines.

Petrol stations generally stock different diesel depending on their location and time of year - Standard Diesel, Highland Diesel and Alpine Diesel. Just ask what type they have at the servo.
- Alpine diesel is only available from a small number of petrol stations in Vic (all very close to the mountains) and is good for very low temps.
- Highland diesel is sold in areas which generally get cold, but do not dip far below zero (inland areas, but not necessarily in the mountains).
- Standard diesel is what you'll find in the major centres.

If filling up with Alpine diesel when very low temps are expected, you want to put in at least 3/4 of a tank!

Other methods if Alpine diesel not available:
- Adding Kerosene or Lamp Oil to the diesel is one way to reduce the temperature at which the wax crystals will form. These methods are rather impractical for many people as you end up having to add significant quantities of kero or lamp oil.
- Diesel additives do not change the temperature which the crystals form. Some additives can inhibit the crystal growth to smaller sizes and shapes so that they are less likely to block your filter.

Enjoy the snow!