I can shed some light on the original post with regards frothing.
Here in WA, BP fuel is refined here, in WA, Kewdale to be precise.
Caltex, shell, puma and all others are shipped into Coogee from Singapore.
The non BP fuels have more sulphur and other chemicals added to help deal with the possibility of salt contamination during transit.
I work for a large company who delivers the fuels and we also cart the crude into Kwinana which is then piped underground into Kewdale.
It is commonly said that Australian fuel in general is of a poorer quality than other contries around the world. Sad realy as alot of the crude/LNG is from the NW shelf.
Hope this info helps as it intrigued me when i asked the question.
Kezngaz.
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Commitment shows. Quality is what is done when no one is looking.
My mate has a Sahara which he just gets the Toyo mob to service and recently on a trip up north the filter light came on and when asking the Tojo blokes about why, he was told they only service the filter when the light comes on, Mate being a truckie was not impressed as the vehicle had 80,000km on the clock, he now changes it regularly in his own workshop and carries spares.
I buy my oil and filters in bulk keeps the cost way down so the filters all get changed every oil change, much prefer the regular change of fuel filters to having some trouble down the track from contaminants, $50 small price to pay................Prefer the big brand fuel but sometimes you don't have a choice but only if they look like a high diesel turn over.
New vehicles manufactured after 1 January 2016 and sold to an EU member country must meet the new Euro/ECE design standards.
Some of these standards you know of such as banning the expensive and ineffective AdBlue in favour of DPFs that use the turbo to do a high temp burn, but lesser known is the requirement for fuel filters to be 2micron and designed to last at least 80,000km (usually changed at the 60,000km service). With this in mind, fitting aftermarket fuel filters to new diesels is pointless.