Saudi Aramco, Asia's top naphtha supplier, will delay all shipments of the fuel from Rabigh refinery, but the reasons for it were not immediately clear, traders said on Wednesday.  

The 400,000 barrels per day (bpd) Rabigh refinery restarted operations around second-half of June following planned maintenance that started on April 21.   

"I think Saudi Aramco may have some issues with the naphtha specifications after the refinery restarted," said a trader.  

But this could not be confirmed as Saudi Aramco officials could not be immediately reached for comments.