if your modded you should change your oil more often, esp. if ur gonna keep your car.
$65 will buy u the oil from bmw and the oil filter. easy job, than dont reset the oil interval so in about 8k more miles they change it for free.
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Current: E63S AMG 4matic RENNtech || M5 Evolve..Eventuri || F10 LCI 535i MHD
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