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Sylvania Silverstar Ultras have a short lifespan. I used these on a Civic with DRL. On my first set, I had both bulbs go out at the same time in 5 months (10,000 miles). The replacement set averaged 5 months for the driver's side (11,000 miles) and 6 months on the passenger's side (18,000 miles). Sylvania is quick to replace them under warranty.
I had PIAA H4 Xtreme White installed that lasted 8 months (18,000 miles) on the driver's side and 11 months (25,000 miles). I made two attempts to get them covered under warranty and both times the CSR lost my information. I gave up after that but if anyone has any issues, I suggest filing a complaint with the BBB and State Attorney General for failing to honor their warranty.
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