Tapering risk on Thai Oil Public Co. Ltd.'s clean fuel project, along with improved cash flows and debt profile from a recapitalization plan, liquidity support and favorable refining conditions in the past two years, should help the company deleverage. We raised our assessment of Thai Oil's stand-alone credit profile (SACP) to 'bb-' from 'b+'. In our view, Thai Oil remains a highly strategic subsidiary of PTT Public Co. Ltd. (PTT) given their strong operational linkages. On April 25, 2024, we affirmed our 'BBB' long-term issuer credit rating on Thai Oil and the 'BBB' issue rating on the company's U.S. dollar-denominated senior unsecured notes. The stable outlook on Thai Oil mirrors that on our local currency issuer credit rating on PTT.