SINGAPORE, March 10 (Reuters) - Aramco Trading Co, the trading arm of world No.1 oil exporter Saudi Aramco, is seeking 1.2 million to 4.6 million barrels of gasoil with 10 parts per million (ppm) sulphur content for delivery over March and April via multiple tenders, trade sources said.

The sources said this was a restocking exercise ahead of Ramadan holidays and as Saudi Aramco's Ras Tanura refinery will be shut for maintenance from March to mid-April.

The purchases will cater to domestic demand, a Singapore-based trader said.

Aramco's demand comes as the global oil market is reeling from the impact of disruption in Russian oil exports due to sanctions over the Ukraine crisis. Russia is the world's top exporter of crude and oil products combined, at around 7 million barrels per day, or 7% of global supply, according to the International Energy Agency.

Spot premiums for 10ppm sulphur content were at $7.87 a barrel on Wednesday, a level not seen since Singapore's benchmark gasoil grade was shifted to 10ppm in January 2018, from 500ppm earlier.

Asian refining margins for low-sulphur gasoil, or the profit of processing benchmark crude oil Dubai into diesel fuel, scaled a record high of $44 a barrel on Wednesday.

Supplies could tighten further after China urged state refiners on Wednesday to consider suspending exports of gasoline and diesel in April as the Ukraine war heightened concern of shortages. (Reporting by Koustav Samanta Writing by Mohi Narayan Editing by Florence Tan and Mark Potter)