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Filler Caps

Breath Easy: Oil Filler Caps & Breathers

The Oil Filler Cap does more than just plug a hole—on vintage cars, it is often a critical part of the crankcase ventilation system.

Ventilated vs. Sealed

  • Breather Caps: Many pre-PCV engines use a "Breather" style cap with wire mesh inside to filter air entering the engine. If this clogs, you blow seals.

  • Sealed Caps: For closed PCV systems.

  • Style: Chrome, painted, and "twist-on" or "push-on" styles to match your valve covers correctly.

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