Three cargoes of 10 ppm sulphur gasoil, one cargo of 50 ppm sulphur gasoil and two cargoes of 500 ppm sulphur gasoil were available via the tender, which closes on April 14 with same-day validity, they added.
These spot lots of 300,000 barrels each are all for loading between May 22 and May 30.
GS Caltex also offered at least three cargoes of jet fuel in a tender that closed on April 12, after selling at least two 500 ppm sulphur gasoil cargoes on April 6, signalling that scheduled maintenance work at its Yeosu refinery could be ending soon.
One of the four sources added that the current gasoil market price structure could also be forcing refiners to clear out May inventories given the better netbacks, with June swap prices lower than May.
GS Caltex typically does not comment on details of its sales
tenders.
(Reporting by Trixie Yap
Editing by Jason Neely and David Goodman
)