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      01-18-2013, 06:05 PM   #6
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Drives: 2003 Z4 2.5i
Join Date: Jan 2013
Location: Texas

Posts: 111
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I tested both Castrol and mobil 1 0w30. There was no significant difference, but mobil 1 seems to idle so well, you can't even tell the engine is on. No ticking sound coming from the engine. Castrol still has a dark honey hue color while mobil 1 is darker after changing the oil 8500 miles. IMO you can't go wrong with either, but i run castrol 0w30.