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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.