2018 Audi RS 5 Bulb Size

Goal: If you’ve struggled to find the correct bulb size for a 2018 Audi RS5, this chart solves that confusion by listing OEM and recommended aftermarket bulbs by function. The problem is mismatched bulbs and wasted time; this list reduces that risk by showing compatible sizes, common trade-off choices, and any fitment constraints to watch for. Prerequisites and step by step are simple: identify the lamp (headlight, fog, turn, brake), compare the listed size to the part you removed, and use the chart’s recommended alternatives when an OEM option is unavailable. Assumption: you have basic tools and validation is a visual fit and functional test. Troubleshooting and wrap up: if a bulb doesn’t seat or flickers, recheck connector integrity and ground. Affiliate disclaimer: some links earn a commission at no extra cost to you; recommendations are selected for compatibility and reliability.