BMW 3 series Convertible, E93 (USA)

Additional Notes

• Across all six configurations of the BMW 3 Series Convertible E93 (USA) — the 328i with N51 SULEV, 328i with N52, 335i with N54, 335i with N55, 335is with N54, and M3 — the coolant specification is expressed as a fill level range rather than a fixed volume. A "between min and max" designation means the cooling system is serviced by topping up to a marked reservoir level, not by measuring a precise fluid quantity.
• The "between min and max" fill method is consistent across both the naturally aspirated engines (N51, N52) and the turbocharged engines (N54, N55) in the E93 lineup, as well as the high-performance M3 variant.
• All six configurations carry a Normal use condition for coolant service. In fluid service contexts, a Normal use designation typically reflects standard operating environments, as opposed to Severe use conditions that would apply to more demanding driving or climate scenarios.
• The 335i Convertible spans two distinct engine generations within the E93 production run. The N54 twin-turbocharged inline-six was used from 2007-2010, while the N55 single-turbo inline-six replaced it from 2010-2013, yet both share the same "between min and max" coolant fill specification.
• The 335is Convertible, which uses the N54 engine from 2010-2013, shares the same coolant fill specification as the standard 335i N54 from 2007-2010, despite the 335is being a higher-performance variant with distinct engine tuning.
• The M3 Convertible, which uses a naturally aspirated V8 engine rather than the inline-six found in the 328i and 335i variants, still follows the same reservoir-based coolant fill specification across the 2007-2013 model years.