not a dumb question. but I only use Chevron, I would not use COSTCO gas. that's just me.
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Sold - 2014 F01 750Li xDrive CBM M-Sport
Sold - 2013 E92 M3 SS w/ ZCP l ZPP l 2MK l 6NR l 752
Sold - 2009 E92 335i LMB M-Sport
Sold - 2003 E46 M3 LSB SMG
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