Just because no one mentioned it, I use Castrol Edge so far with K&N filter. Where are you guys getting the German Castrol?
My last car (E46 M3) had special oil: Castrol Motorsport 0-60. That was German oil I beleive and you had to get it from the dealer. There were some that would sell you them for about $9 a quart. I guess I just went with Castrol out of habit from the last car hoping some of the same magic from the M3 oil goes into Edge lol.
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