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Message: <blockquote data-quote="e46_UDM" data-source="post: 27068" data-attributes="member: 19448"><p>Dear Sifu,Would like to get some feedback regarding the mixing of engine oil with different viscocity and/or brand during top up. Currently I'm using X brand fully syn 5W 30 and it's required top up. Assumed that I can't get the same engine oil. What is the damage (if any) or will it upset the engine if I:[1] top up from Y brand fully syn but same viscocity (i.e. 5W 30) engine oil.[2] top up from X brand fully syn but different viscocity (e.g. 5W 40) engine oil.If mixed with the sme amount of engine oil but different viscocity, will the viscocity been average out i.e. 5W 30 + 5W 40 = 5W 35? Hope to get some feedback and apologises for asking a rather naive question. Thx in advance.</p></blockquote><p></p>