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Message: <blockquote data-quote="aoch88" data-source="post: 588962" data-attributes="member: 8491">Bro Navarone, I've been using my N53 530i for around 9 months now and so far everything is alright except the top valve cover was stuck and has to be replaced. Damage is around RM1.5K. I run on Petronas RON95 and the fuel quality isn't about the RON level but chemical contents (especially sulphur) in our fuel <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> You can go ahead and use RON 95 but of course, RON 97 gives you more oomph when you accelerate :dSo far HPFP is fine (touch wood) but this is one of the common part that fails. Damage is around RM1.3K</blockquote>