It's normal. The letter means you pass the interview and they place you in recommended list. By recommended list means your resume and details are available for every manager level and above, and HR department from all petronas subsidiaries company for review. Whichever OPU is interested, they may raise to HR central. But that is typical for fresh graduate, since they don't have specific experience, so any location and job will do.

As for your case, since you went for an interview for a particular position, my guess is you are in. But don't take my word for it. Just wait patiently for your official offer letter  Happy waiting 

What does "recomended" means? I have read previous post discussing this matter but i still don't get it.
Anyone with experience can tell me what I should do because I have already graduated and hoping to go back to Malaysia by the end of this year. Basically i attended the UKEC fair in London recently and went for Petronas SI interview. I applied for project engineer and mechanical engineer position. It is a bit weird because clearly, i have stated that i have graduated in 2008. So recomended means it is not necessary that i get the job with Petronas and this depends on the availability of the positions in Petronas? How weird