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Castrol Syntec 5w-30 is not the same and is not recomended if you are the anal retentive type (like me).
Use BMW 5w-30 (made by Castrol but different oil). Also use Castrol 0w-30 or Mobil 1
0w-40 (best choice).
The regular Castrol 5w-30 won't hurt anything, nothing to worry about. Would just change to one of the above in 5k-7.5k miles.
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