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Message: <blockquote data-quote="ryucky81" data-source="post: 217637" data-attributes="member: 1672">bro Tohsan. 4 me, me will change every 5k km. me using 15-45 mineral. bcos shiok to hear a quite engine sound due to thick oil.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /> n told by some old bird old engine use mineral better.(this 1 no commend but will try other fully or semi engine oil when coming servicing) engine oil is personal preference some will go 4 fully syntetic some go for semi syntetic n some will go for mineral engine oil.  beside engine oil don forget about ur auto transmission oil.check those rubber hose c whether it oredy soft or leaking liao. mine oso old e39 year 98.</blockquote>