Hi all, Please I need help or suggestion regarding to engine oil. I got 2.5tdi v6 and I usually using Quantum Longlife 3 5W-30 or Castrol 5W-30 but I read article that I should use Quantum Platinum 5W-40 or Platinum Plus 5W-30. I got dilemma right now which is the right oil for my engine. What is the different between those oils? Thanks for your opinion.