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I had the coolant replaced in 3.5 years / 31,000 miles. My SA recommended replacing the coolant and the PS Fluid. Yet to do the PS fluid though.
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2016 BMW 340i 688 | LCL5 | 4FT | ZMT | ZTP | ZDA | ZLP | 494 Formula One Pinnacle 30 Tint | Brushed Aluminum Pedals |