The strike had raised the prospect of fuel shortages during the soy and corn harvest in the South American country, one of the world's biggest grains suppliers.

"Because we've come to an agreement, we're already in the process of lifting the measure across the country," Pedro Milla, union secretary for the Federation of Oil, Gas and Biofuels Workers, told Reuters.

The Labor Ministry had been mediating talks between the workers and the Oil Industry Chamber, which groups leading energy firms.

The refinery workers wanted a 32 percent pay rise, but Milla said they had accepted a 25 percent increase and additional benefits.

Strikes and strike threats are common at this time of year in Latin America's No. 3 economy as trade unions negotiate salary increases, with high inflation stoking recent demands for hikes of around 25 percent on average.

The biggest refinery operators in Argentina are YPF, the local unit of Spain's Repsol YPF, Royal Dutch Shell, Petrobras and Exxon Mobil Corp. under the brand name Esso.