| It's very interesting to read your blog, lots of things to learn. After reading your article regarding the gear box oil of BMW, I
 am wondering should I follow the BMW advise to change the
 enginee oil every 20,000 Km (or once a year) or I should change more
 often.
 I am using a 2008 X5 3.0si, got it at 2007 Dec with 20K KM so far,
 but still did not change the oil yet..  Because everytime I went to
 their service centre, they said 'not necessary".  Could you advise
 your professional idea?
 Sorry to mention that I am living at Edmonton, Alberta.
 Thanks so much!!
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