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Singapore's onshore stocks of residual fuels recorded their most significant increase in over four years during the seven days up to Wednesday, November 13, according to data released by International Enterprise (IE) Singapore - an agency operating under the Ministry of Trade and Industry.

Stockpiles of residues, a category which includes fuel oil and low-sulphur waxy residue and excludes bitumen, climbed 3.81 million barrels, or 22 percent, to 20.7 million barrels. It is the largest weekly gain since August 2009.

Inventories of middle distillates, a category which includes products such as gasoil, or diesel, and kerosene, rose by 1.32 million barrels, or 15 percent, to a six-week high of 9.85 million barrels, the data showed.

Light distillate stocks, a category which includes naphtha, gasoline and reformate, decreased by 60,000 barrels, or 0.5 percent, to 11 million barrels over the same seven-day period. It is the first decline in three weeks.

Inventory levels are collated on a weekly basis for each 7-day period ending on a Wednesday.