2018 Cadillac CTS Bulb Size
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Bulbs Chart
2018 Cadillac CTS Headlight Bulb High Beam and Low Beam (D3S)
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Best Choice, D3C
POWERFUL LIGHT FROM XENON HID BULBS OFFER MAXIMUM SAFETY: Xenon HID (High Intensity Discharge) headlight bulbs offer twice as much light* for safer driving in all conditions while consuming 50% less power. The intense white light produced by the Xenon HID lamps is comparable to daylight. Studies have demonstrated that...
Philips D3S Standard Authentic Xenon HID
Xenon HID Conversion Kit
2018 Cadillac CTS License Plate Light Bulb (2825)
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Premium Pick
SYLVANIA LED bulbs deliver a balanced combination of performance and value. Tuners and auto enthusiasts alike can replace their vehicle’s incandescent lights with a bright and long-lasting LED bulb for a unique and modern look simply and cost-effectively.Sylvania White Mini Bulb
Halogen Lights
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For Car Dome, Map Door, Courtesy, License Plate Lights
– Better beam pattern: each bulb has 5 pcs high power SMD led, color temperature: 6000K(xenon white), voltage: 12V – No polarity no flip: it is truly no polarity, can light on two sides, no need more modification or flip, plug and play, easy install within 5 minutes. Products with electrical plugsMarsauto LED Light Bulb 6000K Replacement Bulbs
LED Lights
2018 Cadillac CTS Back Up Reverse Light Bulb (921)
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Best Choice
Replace your standard car lights with our robust Philips Vision LEDs that deliver dynamic lighting for your vehicle, both inside and out. The innovative design and unmatched performance of Philips Vision LEDs are available for brake and taillights, backup lights, dome lights, and license plate lights. These bulbs are coveredPhilips 12789LPB2 Bright White Vision
Halogen Lights
2018 Cadillac CTS Dome Light Bulb (2825)
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Premium Pick
SYLVANIA LED bulbs deliver a balanced combination of performance and value. Tuners and auto enthusiasts alike can replace their vehicle’s incandescent lights with a bright and long-lasting LED bulb for a unique and modern look simply and cost-effectively.Sylvania White Mini Bulb
Halogen Lights
-
For Car Dome, Map Door, Courtesy, License Plate Lights
– Better beam pattern: each bulb has 5 pcs high power SMD led, color temperature: 6000K(xenon white), voltage: 12V – No polarity no flip: it is truly no polarity, can light on two sides, no need more modification or flip, plug and play, easy install within 5 minutes. Products with electrical plugsMarsauto LED Light Bulb 6000K Replacement Bulbs
LED Lights
2018 Cadillac CTS Headlights
![AKKON - Fits 2013 2014 2015 2016 2017 2018 Cadillac ATS Sedan [Halogen Type] Projector Chrome Headlights Pair Driver+Passenger](https://m.media-amazon.com/images/I/51JltmJhGLL._AC_QL90_UL90_.jpg?ezimgfmt=0)
2018 Cadillac CTS Tail Lights
Cadillac CTS Bulb Size By Years
Misconception: you might think bulb sizes are interchangeable or that one listing fits every 2018 Cadillac CTS. It seems true because many bulbs look similar and parts sites mix terminology, but think of it as a mental model problem — fit and function matter, not just shape.
What is true: this list shows the specific bulb types used on a 2018 Cadillac CTS, why each circuit needs that size, and a quick rule of thumb for replacements and upgrades. Implications: matching the correct size avoids fit problems and electrical headaches, and it keeps beams aligned and legal. Quick tests: compare the OEM part number, test with sockets off the car, and measure physical length before buying. Affiliate note: some links are affiliate links, which may earn a small commission at no extra cost to you. Quick recap: use the chart to match fit, not guesswork.
2018 Cadillac CTS specs
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