OP - it probably does not make any difference. That said, I would stick to one type of oil brand name for the entire cars life span.
I would use what BMW reccomends: Castrol oil. And the DIY oil change kits that Tischer and United sell are darn cheap. $70 or so for everything you need. You won't be saving that much going elsewhere for oil. Plus the oil BMW sells is made by Castrol and is of the correct "BMW LL-1" rating.
Everyone has thier favorite oil brand... it does seem almost religous-like when we get into these oil debates. But I would go with what BMW reccomends.
Dackel
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