The Sasref refinery, a joint-venture between Saudi Aramco and Royal Dutch Shell, has started commercial production at an ultra-low sulphur diesel unit, targeting European markets, Reuters has reported. The unit at the 305,000 barrels per day refinery in Jubail, started production of around 100,000 bpd of clean diesel, making it among the first Saudi producers with sulphur at less than 10 parts-per-million, the company said. The crude refinery can export as much as 60,000 tonnes of oil products per day, mainly fuel oil, naphtha, gas oil and jet.