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      05-24-2011, 02:50 PM   #5
elm3
M3 Lover
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Drives: 2009 e92 M3 Interlagos Blue
Join Date: Sep 2008
Location: Canton, GA.

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I change my oil every 7,500 miles. It is synthetic and it will not break down like conventional oils. But oil gets dirty and all you are doing is moving metal particles and dirt all on your bearings and such. As far as tranny and rear diff. I will be doing that when the car turns 30k. It is also good to flush your radiator once every two years. I will be doing mine this coming fall. BMW doesn't flush radiators, they call it lifetime fill.
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'09 E92 ///M3 Interlagos Blue, 6MT, Silver Novillo Leather, CF Trim, Premium Package, Technology Package, Cold Weather Package, Premium Sound, 19" Wheels, Moonroof-Toy/ '14 335i, Sport Line, Premium Package, Technology Package, 19" wheels, Heated Seats - Daily Driver/ '04 Yamaha R1 - Toy/ '06 Yamaha Raptor 350-Toy