GS Caltex sets guidance for 5-yr dollar bonds-source

HONG KONG, June 24 (Reuters) - GS Caltex, South Korea's second-biggest oil refiner, set guidance for a five-year dollar bond sale at 375-390 basis points over Treasuries, a source with direct knowledge of the plans said on Tuesday.

No size was provided, though market sources had previously said the offering would be about $300-$500 million.

Moody's had put the size at up to $600 million in a statement that had rated the proposed debt Baa1.

GS Caltex had received about $200 million in orders so far, said the source, who asked not to be identified because he was not authorised to talk to the media about the transaction. The deal would be priced on Tuesday or Wednesday, the source added.

The proposed debt by the oil refiner, a joint venture between South Korea's GS Holdings Corp (078930.KS) and U.S. company Chevron Corp (CVX.N), is rated BBB-plus by Standard & Poor's, or seven notches below the top investment grade.

Barclays Capital, Citigroup (C.N), Goldman Sachs (GS.N) and Merrill Lynch MER.N are arranging the sale. (Reporting by Rafael Nam; Editing by Anne Marie Roantree)