Sunday, Dec 18, 2022 at 07:54
Hi Warrie,
I have been retired now for 12 years, but things haven’t changed that much with regard to product specs. Each State or Territory has different specs throughout the year. Also, the spec in one state, may not be the same in another state even at the same time of year, it is all to do with the ambient temperatures at various times of the year, in each state. Of course, sometimes the spec may be the same from one state to another, again, depending on the time of year.
There are actually three different specs for diesel in the southern states, Summer, Winter & Intermediate, so depending on the time of year, and the ambient temperature, the diesel can look slightly different. Also, as you have stated, the vast majority of automotive fuels now being sold in Australia come from overseas, mostly Asia, however, they are refined to our specifications. The most variation is in the Cloud Point spec. That is the temperature at which wax crystals begin to form in diesel. For instance, in Summer, the Cl. Pt. Could be as high as 0 degrees Celsius, and in Winter as low as -9 degrees Celsius. Then of course there is the Alpine or Wintermix Diesel sold in the High Country during winter. This is a specific legislated blend of diesel and light heating oil.
All of the major Oil Companies “share” distribution terminals in various
places throughout Australia. The fuel is stored in bulk storage tanks, and fed to the Tank Truck Fill Stand (TTFS), through the same pipes, from the same pumps, to the same loading arms, there is no segregation of product by Oil Company. I often laugh at the comments from some people who say they only use a specific brand of diesel because they get better economy, or because it has higher specifications. It is all the same in the majority of cases, with the detergent additives being the only difference. These additives are injected into the fuel during loading of the tank truck at the TTFS. In some cases, the additives are also the same. With premium diesel, these additives are anti foaming and detergents, they are not a performance enhancer, they do not increase the Cetane index or number, only keep the fuel injection systems cleaner.
Macca.
FollowupID:
921849