Oil-Fill Caps

What is the Benefit of the Oil Breather Cap?

An oil breather cap, also known as an oil filler cap, serves a crucial role in an engine's ventilation system. Its primary benefit is to allow the crankcase to breathe, which helps regulate internal pressure. As the engine operates, air and vapor can accumulate in the crankcase due to the heating and cooling cycles. The oil breather cap features a one-way valve or a filter that allows air to flow out of the crankcase while preventing debris, contaminants, and oil from entering. This ventilation process helps maintain optimal pressure levels within the engine, promoting efficient combustion and reducing the likelihood of oil leaks.

What Causes Oil to Come Through the Breather?

Oil coming through the breather cap can be an indication of an underlying issue within the engine. Several factors can contribute to this problem:

• Excessive Blow-by: Blow-by occurs when combustion gases escape past the piston rings into the crankcase. This can result in increased pressure and oil vapor being forced out through the breather cap.
• Worn Piston Rings: Worn or damaged piston rings can lead to increased blow-by and oil consumption.
• High RPM Operation: Extended high RPM operation can cause higher crankcase pressure, potentially leading to oil escaping through the breather.

If you notice oil coming through the breather cap, it's advisable to have your engine inspected by a professional to identify and address the root cause.

How Much Does an Oil Breather Cap Cost?

The cost of an oil breather cap can vary based on factors such as the brand, material, and any additional features it offers. Basic oil breather caps may be more budget-friendly, while those with advanced designs, improved ventilation, or decorative elements could be in a higher price range. It's important to choose a breather cap that is compatible with your engine and offers the necessary ventilation characteristics. JEGS offers a range of oil breather caps, including specific options like LS3 oil caps and Ford Racing oil caps, to suit different engine types and preferences.