4 Years Available
BMW 635csi Light Bulb Sizes
Complete bulb size reference for the BMW 635csi from 1985 to 1989. Find headlight, fog light, turn signal, and brake light bulb sizes for every model year.
The BMW 635csi changed low beam specifications across model years — 1985–1988: H5006; 1989: 9006. Make sure to select your exact year below to get the right bulb size.
Year Range
1985 – 1989
4 model yearsBulb Sizes Across Years
| Position | Bulb Type(s) | Years | Status |
|---|---|---|---|
| Side Marker | W5W(1988–1989) | 2 years | Consistent |
| Turn Signal Front | 7528(1985–1989) | 4 years | Consistent |
| Low Beam | H5006(1985–1988) 9006(1989–1989) | 4 years | Changed |
| Fog Light | H1(1988–1989) | 2 years | Consistent |
| High Beam | H5001(1985–1988) 9005(1989–1989) | 4 years | Changed |
| Parking Light | 7528(1985–1989) | 4 years | Consistent |
Common 635csi Replacement Parts
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Frequently Asked Questions
We have bulb size data for the BMW 635csi from 1985 to 1989, covering 4 model years. Select your year below for a complete position-by-position bulb chart.
Yes, the BMW 635csi changed low beam bulb specifications across generations: 1985–1988: H5006; 1989–1989: 9006. Make sure to check your exact year using the list below.
The BMW 635csi uses a H5006 bulb for the low beam and a H5001 for the high beam, and a H1 for the fog lights. Select your year below for the exact fitment chart.
Yes. The BMW 635csi uses a H5006 low beam, and direct-fit LED conversion kits for that size are widely available. LED upgrades typically produce 2–3× more light output than stock halogen and last 25,000+ hours. Look for a DOT-compliant kit with a proper beam cutoff pattern.
Select your model year from the list below. Each year page shows every bulb position — low beam, high beam, fog light, turn signal, and brake light — with the correct size and a link to buy it on Amazon.