How To Install Oil Catch Can – Your Complete DIY Guide For Cleaner

ByRobert Lozano

An oil catch can is a simple, yet highly effective device designed to trap oil vapor and other contaminants from your engine’s positive crankcase ventilation (PCV) system before they can re-enter the intake manifold. Installing one is a straightforward DIY project that significantly contributes to engine longevity, performance, and cleaner emissions, making it a smart upgrade for any car, truck, or even some motorcycle engines.

Tired of seeing gunk build up in your intake manifold, robbing your engine of power and efficiency? You’re not alone. Modern direct-injection engines, in particular, are prone to carbon buildup, but even older port-injected vehicles can benefit from keeping oil vapors out of their combustion chambers.

The good news is, there’s a practical solution to this common automotive headache: an oil catch can. In this comprehensive guide, we’ll walk you through everything you need to know about how to install oil catch can, ensuring your engine breathes cleaner and performs better for years to come.

From understanding the benefits to a step-by-step installation process, we’ll cover essential tips, tools, and best practices to help you tackle this upgrade with confidence. Get ready to give your engine the clean air it deserves!

Why You Need an Oil Catch Can: The Benefits for Your Engine

Before diving into how to install oil catch can, it’s crucial to understand why this simple modification offers such significant advantages. It’s more than just a performance tweak; it’s about long-term engine health and efficiency.

Understanding PCV and Blow-by

Every internal combustion engine produces “blow-by” gases – a mixture of unburnt fuel, oil vapor, and combustion byproducts that escape past the piston rings into the crankcase. To prevent these harmful gases from polluting the atmosphere, your engine utilizes a Positive Crankcase Ventilation (PCV) system.

The PCV system routes these gases from the crankcase back into the intake manifold to be re-burned. While this is an effective emission control strategy, it has a downside: the oil vapor and contaminants within the blow-by gases can deposit themselves on crucial intake components. This is where an oil catch can steps in, intercepting these impurities before they reach your engine’s sensitive parts.

Protecting Vital Engine Components

The primary benefit of installing an oil catch can is protecting your engine from harmful deposits. Over time, oil and carbon buildup can:

  • Clog intake valves: Especially prevalent in direct-injection engines, this leads to reduced airflow, misfires, and decreased power.
  • Foul spark plugs: Excess oil can contaminate spark plugs, causing poor ignition and reduced fuel economy.
  • Contaminate the intercooler: In turbocharged or supercharged vehicles, oil can coat the intercooler’s fins, reducing its efficiency in cooling intake air.
  • Dilute fuel and oil: Unburnt fuel and moisture can mix with your engine oil, reducing its lubricating properties and shortening its lifespan.

By preventing these issues, an oil catch can helps maintain your engine’s peak performance and extends its operational life.

Sustainable Engine Health

Beyond performance, an oil catch can contributes to more sustainable engine health. By keeping your engine’s internals cleaner, you can potentially reduce the frequency of costly deep cleaning services, such as walnut blasting for intake valves. It also helps your engine run more efficiently, which can contribute to slightly better fuel economy and reduced emissions over the long run, making it an eco-friendly how to install oil catch can decision.

Choosing the Right Oil Catch Can for Your Ride

Before you begin the physical process of how to install oil catch can, selecting the appropriate unit is paramount. Not all catch cans are created equal, and the right choice will depend on your vehicle, driving style, and budget.

Types of Catch Cans: Baffled vs. Non-Baffled

The internal design of an oil catch can significantly impacts its effectiveness:

  • Non-Baffled Catch Cans: These are essentially empty containers. While they can trap some liquids, they are far less efficient at separating oil vapor from air. We generally advise against these for optimal performance.
  • Baffled Catch Cans: These are the gold standard. They feature internal baffles, screens, or filtration media that create turbulence, causing oil vapor to condense and separate from the air. Look for multi-chamber or multi-stage baffled designs for superior filtration. Some even include a dipstick for easy fluid level checks.

For the best results and to truly reap the benefits of how to install oil catch can, always opt for a high-quality baffled unit.

Sizing and Placement Considerations

Consider these factors when selecting your catch can:

  • Capacity: A larger capacity means less frequent draining, which is convenient, especially for daily drivers or off-roaders.
  • Port Size: Ensure the inlet and outlet ports match the diameter of your PCV hoses. Common sizes are 3/8″ or 1/2″.
  • Mounting Location: Plan where you’ll mount the can under the hood. It needs to be easily accessible for draining, away from extreme heat sources, and have enough space for the can itself and the hoses. Look for existing bolt holes or flat surfaces. This is a crucial part of how to install oil catch can best practices.

Kit vs. Custom Setup

Many manufacturers offer vehicle-specific oil catch can kits. These kits typically include:

  • The catch can itself.
  • Pre-cut, vehicle-specific hoses with correct fittings.
  • A custom mounting bracket for your vehicle.
  • All necessary clamps and hardware.

While a bit more expensive, a kit simplifies the installation process significantly, as it takes the guesswork out of hose lengths, fittings, and mounting. If a kit isn’t available, you’ll need to source universal components, including appropriate oil-resistant hoses (often reinforced silicone or braided lines), fittings, and a universal mounting bracket.

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Tools and Materials You’ll Need for the Installation

Having the right tools on hand makes the installation process smooth and hassle-free. Here’s a checklist for how to install oil catch can:

Essential Hand Tools

  • Socket Wrench Set: For various bolts and nuts.
  • Screwdriver Set: Flathead and Phillips for hose clamps and other fasteners.
  • Pliers: Needle-nose, regular, and possibly hose-clamp pliers.
  • Utility Knife or Hose Cutter: For cleanly cutting new hoses to length.
  • Zip Ties or Cable Clamps: For securing hoses and preventing chafing.
  • Measuring Tape: To accurately measure hose lengths.
  • Marker: To mark hose cut points.
  • Torque Wrench: For tightening mounting bolts to specification (optional, but good practice).

Catch Can Kit Components (if not a kit)

  • The Oil Catch Can: With appropriate inlet/outlet sizes.
  • Oil-Resistant Hoses: Ensure they are designed for automotive use and can withstand oil, fuel, and engine bay temperatures. Reinforced silicone hose is a popular choice.
  • Hose Clamps: High-quality clamps to secure all connections.
  • Fittings/Adapters: If your catch can or hoses require specific connections (e.g., AN fittings, barb adapters).
  • Mounting Bracket: A sturdy, universal bracket if not included in a kit.

Safety Gear First

Always prioritize safety when working on your vehicle:

  • Safety Glasses: Protect your eyes from debris, oil, or chemicals.
  • Gloves: Protect your hands from grease, sharp edges, and hot engine components.
  • Shop Rags or Paper Towels: For cleaning up spills.

Step-by-Step Guide: How to Install Oil Catch Can Like a Pro

This section provides a general guide. Always consult your vehicle’s service manual or the catch can manufacturer’s instructions for specific routing and torque specifications. This is the core of our how to install oil catch can guide. Safety Note: Ensure your engine is cool before starting work. Disconnect the negative terminal of your battery to prevent accidental electrical shorts.

Pre-Installation Checks

  1. Identify the PCV System: Locate the PCV valve and the hose that runs from the crankcase (or valve cover) to the intake manifold. This is the hose you will be interrupting. On some vehicles, there might be two PCV lines (a clean side and a dirty side); generally, the catch can goes on the “dirty” side, where crankcase gases are drawn into the intake manifold by vacuum. If unsure, consult a vehicle-specific forum or guide.
  2. Test Fit the Catch Can: Find a suitable mounting location for the catch can. It should be easily accessible for draining, clear of moving parts (belts, pulleys), and away from extreme heat sources (exhaust manifolds). Ensure there’s enough room for the can itself and for hoses to run cleanly without kinks.
  3. Gather All Tools and Parts: Double-check that you have everything listed in the previous section.

Locating the PCV System and Removing the Stock Hose

  1. Trace the PCV Hose: Follow the PCV hose from the valve cover (or crankcase breather) to the intake manifold. This is typically a rubber or plastic hose.
  2. Carefully Disconnect: Using pliers or a screwdriver (depending on the clamp type), loosen the hose clamps at both ends of the PCV hose. Gently twist and pull to remove the hose. Inspect the hose for any cracks or damage; if it’s old, it might be brittle.
  3. Inspect PCV Valve: If your PCV valve is part of the hose or easily accessible, now is a good time to inspect it for clogs. Replace if necessary.

Cutting and Routing Hoses

  1. Measure and Cut Hoses: Hold your new oil-resistant hoses up to the engine bay, tracing the path from the PCV valve/port to the catch can, and then from the catch can back to the intake manifold port. Aim for the shortest, most direct route possible, avoiding sharp bends or kinks. Use your utility knife or hose cutter for clean, straight cuts. Pro Tip: Cut a little long and trim down if needed. You can’t add hose back!
  2. Install Fittings: If your catch can or hoses require specific fittings (e.g., threaded NPT to barb fittings), apply a small amount of thread sealant (PTFE tape or liquid sealant) to the threads before tightening them into the catch can.

Mounting the Catch Can Securely

  1. Attach Bracket to Can: Secure the mounting bracket to the catch can using the provided hardware.
  2. Mount Catch Can to Vehicle: Position the catch can in your chosen location. Use existing bolt holes if possible. If drilling is required, ensure you know what’s on the other side before drilling to avoid damaging vital components. Use appropriate bolts, washers, and nuts to secure the bracket firmly. A loose catch can will vibrate and could cause issues.

Final Connections and Double-Checks

  1. Connect Hoses to Catch Can:
    • Connect one end of your first new hose to the PCV valve/port on the engine.
    • Connect the other end of this hose to the “INLET” port of the oil catch can.
    • Connect one end of your second new hose to the “OUTLET” port of the oil catch can.
    • Connect the other end of this hose to the intake manifold port.
  2. Secure All Connections: Use hose clamps at every connection point (PCV valve, catch can inlet, catch can outlet, intake manifold). Tighten them securely, but do not overtighten, which can damage the hose or fittings.
  3. Route and Secure Hoses: Ensure all hoses are routed away from hot engine parts, moving belts, and sharp edges. Use zip ties or cable clamps to secure the hoses and prevent chafing or sagging.
  4. Final Inspection: Double-check all connections, mounting bolts, and hose routing. Make sure nothing is loose or rubbing. Reconnect your battery.
  5. Test Run: Start your engine and let it idle. Visually inspect for any leaks (especially around hose connections) or unusual noises. Take a short test drive, then re-check the connections after the engine cools.

Common Problems and Troubleshooting During Installation

Even with careful planning, sometimes issues arise. Knowing how to address common problems with how to install oil catch can can save you time and frustration.

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Leaks and Loose Connections

The most frequent issue is a vacuum leak. If hoses aren’t properly clamped or fittings aren’t sealed, unmetered air can enter the intake, leading to rough idle, check engine lights, or reduced performance. Always use high-quality hose clamps and ensure they are tightened properly. If using threaded fittings, use PTFE tape or liquid thread sealant to prevent leaks.

Restricted Airflow

If your hoses are kinked, too small in diameter, or the catch can itself has poor flow characteristics, it can restrict the PCV system’s ability to ventilate the crankcase. This can lead to increased crankcase pressure, potentially causing oil leaks or seal damage. Ensure hoses have gentle bends and that the catch can is adequately sized for your engine’s displacement and power output.

Improper Mounting

A catch can that isn’t securely mounted can vibrate excessively, leading to loosened connections, component fatigue, or even detachment. Always use sturdy brackets and tighten mounting hardware to specification. Ensure the can is mounted vertically (or as specified by the manufacturer) to allow for proper oil separation and draining.

Maintaining Your Oil Catch Can: Care Guide and Best Practices

Installing an oil catch can is only half the battle; regular maintenance is key to its effectiveness and your engine’s continued health. This how to install oil catch can care guide outlines what you need to do.

Regular Draining Schedule

The frequency of draining depends on several factors:

  • Climate: Colder climates often produce more condensation and water in the catch can.
  • Driving Style: Short trips where the engine doesn’t fully warm up will accumulate more condensation.
  • Engine Condition: Older engines with more blow-by will fill the can faster.
  • Catch Can Capacity: Smaller cans need more frequent draining.

As a general rule, check your catch can every 1,000-3,000 miles, or with every oil change. Many cans have a dipstick or a clear sight glass to monitor the fluid level. In winter, check more frequently to prevent the contents from freezing, which could block the PCV system.

Cleaning and Inspection

Periodically (e.g., once a year or every 10,000-15,000 miles), it’s a good idea to:

  • Disassemble and Clean: Take the catch can apart and clean the internal baffles or media with a degreaser or solvent. Ensure it’s completely dry before reassembling.
  • Inspect Hoses and Clamps: Check hoses for cracks, hardening, or signs of wear. Ensure clamps are still tight and rust-free. Replace any worn components.
  • Inspect PCV Valve: If accessible, inspect or replace your PCV valve as part of your regular maintenance.

This proactive approach ensures your catch can remains an effective part of your engine’s ventilation system, aligning with sustainable how to install oil catch can principles.

Environmental Disposal of Contents

The fluid collected in your oil catch can is a mixture of oil, fuel, water, and combustion byproducts. It is considered hazardous waste and should never be poured down the drain or into the environment. Treat it like used motor oil:

  • Collect in a Sealed Container: Store the drained fluid in a dedicated, sealed container.
  • Recycle: Take the container to an automotive parts store, a local recycling center, or a hazardous waste collection facility that accepts used motor oil.

Frequently Asked Questions About How to Install Oil Catch Can

How often should I drain my oil catch can?

The draining frequency varies based on driving conditions, climate, and engine condition. A good starting point is to check it every 1,000-3,000 miles or with every oil change. In colder weather or with frequent short trips, you might need to check it more often.

Can an oil catch can void my warranty?

Generally, installing an aftermarket part like an oil catch can will not automatically void your entire vehicle warranty. However, if a dealership can prove that the catch can directly caused a failure in a specific engine component, they might deny warranty coverage for that particular repair. Choosing a high-quality, properly installed catch can minimizes this risk.

Are oil catch cans legal in all states?

In most states, oil catch cans are legal for street use as long as they do not vent to the atmosphere (i.e., they must be a “closed-loop” system that returns filtered air to the intake). Open-vent catch cans, which release gases into the atmosphere, are typically not street-legal and are intended for racing applications. Always check your local and state emissions regulations.

What kind of hose should I use for my oil catch can?

You should use oil-resistant, reinforced automotive-grade hose, such as silicone or high-quality rubber hose. Standard vacuum line or fuel line might not withstand the constant exposure to oil vapor and engine bay temperatures over time. Ensure the hose diameter matches your PCV ports and catch can fittings for a secure, leak-free connection.

Is an oil catch can necessary for every car?

While not strictly “necessary” for every car to function, an oil catch can is highly recommended for direct-injection engines due to their susceptibility to intake valve carbon buildup. However, any engine can benefit from cleaner intake air, especially if you plan to keep the vehicle long-term or seek optimal performance and efficiency.

Installing an oil catch can is a relatively simple and highly rewarding DIY project that offers significant benefits for your engine’s longevity and performance. By following this guide, you’ve gained the knowledge and confidence to tackle this upgrade yourself, ensuring your engine runs cleaner and more efficiently.

Remember to choose the right components, prioritize safety, and perform regular maintenance to keep your catch can working effectively. Your engine will thank you with smoother operation and potentially fewer headaches down the road. Happy wrenching, and enjoy your cleaner, healthier engine!

Robert Lozano
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