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WHAT'S INSIDE: AUTO

The HowStuffWorks Auto Section contains articles about everything from engine workings to classic cars. Learn about cars on HowStuffWorks Auto.
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Inside Engines

Our engine roundup page page takes you straight to the power. See what's under the hood from the HEMI to the Wankel.

How Grease Caps Work

When it comes to grease caps, you really don't have a choice. If you use them, your wheel bearings continue to work. If you don't, your wheel bearings fail. But what are grease caps, anyway?

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