I have a '99 Silverado w/ almost 60k on it. The left one blew out about 6 mo. ago or so. Ran about a month before I remembered to pick up a package at Wally World. About 2 weeks later the right one blew. Then took me about another month to find where I put the other bulb in the package. At least now I don't have another bulb floating around and trying to remember what it goes to. [img]/forums/images/icons/laugh.gif[/img] I personally will try to keep them replaced as I do think they are a big boost in safety as it helps people see me in the bright evening sun before sunset. Besides it just bugs me to have anything that doesn't work.