You've been lied to: The "3,000 Mile Oil Change" is a scam designed to drain your wallet.

This rule was invented by Quick-Lube shops in the 1970s. Modern synthetic oils and tighter engine tolerances mean most cars can easily go 7,500 to 10,000 miles between changes. Stop throwing away perfectly good oil just because a sticker on your windshield tells you to. Check your actual manual.