If you are buying you headlights at Walmart, stop they are only rated 150 hours. Go to rockauto or similar and get some Long Life bulbs for $6 each went with Hella's for the cobalts and Impala.. I finally started tracking when I replaced them and 150 hours is about it on the last one.
The impala also drops to low 12's a lot, asked when it was in for something else and they said it was normal.
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