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Message: <blockquote data-quote="Greentea" data-source="post: 710172" data-attributes="member: 42896">Dear all Malaysian bros/sis,I am from Singapore.  My wife drives an e90 320i and I drive an e92 335i.  Happy to see great discussions in this forum.I am a regular visitor to Malaysia, for holidays and friend/relative visits. I have a question which has probably been discussed to death both in Msia and SG BMW forums, but I didn't get the answer I was looking for and neither did I find any conclusive view.The question I have, in particular for the 335i which has a n54 TT engine, is which is the correct engine oil in our hot tropical weather.  When my car was still under warranty, the SG dealership uses Mobil-1 0w-40.  Since then, I ve been using Castrol 0w-30 and Liquid Moly 5w-30.  I visited a workshop in JB that services BMWs and was told 30 viscoscity is too light and doesn't give adequate protection in our weather.  They ve suggested to me to use a heavier 40 engine oil instead.Likewise, these workshops suggest instead of using a 40 engine oil currently on my wife's 320i, that I should be using a heavier 50 engine oil !!! Also, I was told that my noisy engine, especially on the 335i, is due to a too low viscoscity oil. What oil do you guys use in Msia?  Does a thicker oil really helps with protection and noise control.Thank you in advance.  And I love your country's food, diversity, scenery and roads !</blockquote>