There are few climate change-related diesel downsides. Burning a litre of diesel creates 2.7kg of CO2 versus 2.3kg for petrol, which is typically offset by the efficiency of an oiler. Local diesel is also closer to European standards than petrol, with the former achieving a sulphur mandate of 10 parts per million (ppm) since last decade, whereas the latter is stuck at 50-150ppm, making it one of the dirtiest forms of unleaded anywhere in the world.
Service stations will attempt to separate truck diesel from passenger (or ‘premium’) diesel as more families turn up on bowser forecourts previously dominated by greasy trucks, but it’s mostly in the pump itself – high-flow being for trucks and smaller nozzles for cars/SUVs. The premium stuff does contain an increased number of cleaning and anti-foaming agents, with the latter helping to fill a tank faster and more completely, but they’re minor points.
Unlike with premium unleaded, which boosts a fuel’s octane rating, diesel’s cetene rating equivalent is unchanged. The only other difference emerges in cold areas where ‘alpine’ diesel helps resist liquid turning lumpy in fuel lines. That isn’t a problem for petrol.