The BMW 750Li front inner turn signal requires a 3457NA bulb size, while front turn signals use either 3357NA or 12961 bulb sizes, and rear turn signals use 12496 or PY21W bulb sizes. The replacement chart covers 2006 to 2008 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW 750Li uses five distinct bulb types across its turn signal positions for the 2006-2008 model years: 3457NA, 3357NA, 12961, 12496, and PY21W.
The 3457NA is a dual-filament T25 wedge bulb rated at 12V with a 27W main filament and a 7W secondary filament, finished in natural amber glass and conforming to ANSI standards for the US and Canadian markets.
The 3357NA shares the same T25 wedge form factor and natural amber glass as the 3457NA but carries only a single filament rated at 27W, making the two bulbs physically similar yet functionally distinct due to the filament count difference.
Because the 3457NA and 3357NA occupy the same T25 housing, the dual-filament 3457NA is not a direct substitute for the single-filament 3357NA in positions that require only one filament, as the wiring circuit determines which filament is activated.
The front inner turn signal position on the BMW 750Li uses the 3457NA for all three model years covered, 2006-2008.
The front turn signal position is served by two separate bulbs per side: the 3357NA for the forward-facing element and the 12961 for the side-marker element, a configuration that applies uniformly across 2006-2008.
The 12961 is a Philips-designated miniature T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, a low-wattage output consistent with its side-marker role rather than a primary signaling function.
The rear turn signal position shows a variation within the 2006-2008 range: the 2007 model year uses the PY21W, while 2006 and 2008 use the 12496.
The PY21W conforms to ECE standards used in European and worldwide markets, featuring a BAU15s offset bayonet base rated at 12V and 21W; its offset base pin prevents accidental installation of a non-amber standard BAY15s bulb in the same socket.
The 12496 is a Philips and Osram part number designating a 12V halogen bulb for specialty applications, and it is not interchangeable with the PY21W due to differing base types and regulatory standards.