depends on what oil your talking about if your changing the motor oil is synthetic oil that must be used. BMW recommends castros synthetic oil but its all your choice on what synthetic oil you want to put in it. i have royal purple in my 325i 2003 and it feels alot better to drive.
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I have a 2002 325i Sport and I have been advised by a loval BMW dealer to use Shell Helix Synthetic. .
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I own a BMW 325Ci (2002, E46), and have run it past the time when it says an oil change is due. The answer to your question, based on my experience, is, "No".
poop
Bolted into the bottom of the oil pan.
At the bottom of the oil pan.