Demand for marine gasoil (MGO) in Brazilian ports has plummeted because the Brazilian government's implementation of a 50pc tax on diesel exports and its derivatives have made the product uneconomical to export.
The tax, which took effect on 12 March, applies to MGO exports and sales in Brazilian ports to internationally flagged vessels. Since then, suppliers have described MGO demand as "non-existent", with participants mainly buying very-low-sulfur fuel oil (VLSFO).
Even domestically flagged vessels have prioritized VLSFO for cabotage because of the higher price of MGO in Brazil.
Disruption at the strait of Hormuz, through which 20pc of the world's oil typically flows, has strained the global oil supply. As a result, the Brazilian market is facing a shortage of diesel derivatives. The tax aims to retain product in the domestic market and contain price increases.
Brazilian suppliers exporting MGO and gasoil to Africa and Europe have also reported that buyers cancelled volumes scheduled for the coming weeks. The 50pc tax makes Brazilian diesel much more expensive than international prices, a supplier said.
Argus assessed MGO in Santos at $1,482/metric tonne (t) and at $1,541/t in Rio de Janeiro on 18 March. Those prices exclude the 50pc tax.

