Catch Can (Yep here is another thread on it)

[David Montgomery]

A $150 catch can is far better than $1500 in media blasting at 150k miles in my opinion. It doesn't hurt anything, so I am not sure why people are so up in arms about it. At the end of the day, everyone should do what they feel is best for their car. You do, and shut up about it. It seems like more people feel like it is OK to put down what others do just to make themselves feel good. Sometimes a shut mouth is the best opinion you can share.

 

[Exquisite_Red]

Edit: Never mind!

 

[Zplz]

In the spirit of "caveat emptor," I'll leave this here courtesy of Google A.I., for what it's worth. Only you can decide.


Catch can and Nissan warranty

Installing an oil catch can in your Nissan
generally does not automatically void your entire vehicle warranty, but it can lead to denied claims for specific engine or emissions-related issues.

How Warranty Coverage is Affected
Under the Magnuson-Moss Warranty Act (in the U.S.), a manufacturer cannot void your entire warranty just because you installed an aftermarket part. However, coverage works as follows:

Burden of Proof: To deny a claim, the dealership or Nissan must prove that the catch can specifically caused the failure.

• Specific Exclusions: If a problem arises that can be traced back to the catch can—such as a leak caused by improper installation or a blown seal due to a frozen/blocked line—that specific repair will not be covered.
• Unrelated Repairs: Your warranty remains fully intact for unrelated systems, such as electronics, suspension, or transmission.
  
  Potential Risks for Warranty Denial
• PCV System Modification: Because a catch can modifies the factory Positive Crankcase Ventilation (PCV) system, some dealers may view it as an unauthorized alteration to the emissions system.
• Winter Issues: In cold climates, condensation in the can or lines can freeze, causing pressure buildup that may damage engine seals.
• Maintenance Neglect: If the can overflows or becomes blocked because it wasn't emptied, any resulting engine damage is considered a "lack of maintenance" and is typically excluded from coverage.
  
  Recommended Best Practices
• Consult Your Dealer: Since individual dealership attitudes vary, ask your service advisor about their policy on catch cans before installation.
• High-Quality Parts: Use reputable brands like Z1 Off-Road, Mishimoto, or J&L Oil Separator that offer direct-fit kits for Nissan models like the Frontier, Titan, or 370Z.
• Reversible Installation: Keep your original factory hoses. Some owners choose to remove the catch can before bringing the vehicle in for major warranty service to avoid potential disputes.

For the
2023+ Nissan Z (RZ34) and its twin-turbo VR30DDTT engine, a catch can is a popular modification to prevent carbon buildup on intake valves, but it must be managed carefully to avoid warranty disputes.

Nissan Z Warranty and Catch Cans
Installing a catch can on your Nissan Z does not automatically void your 3-year/36,000-mile basic or 5-year/60,000-mile powertrain warranty. However, it introduces specific risks:
Nissan USA

• Emissions Compliance: Because it modifies the factory PCV (Positive Crankcase Ventilation) system, some dealers may flag it as an unauthorized emissions alteration.
• Frozen Lines: In cold climates, condensation in the lines can freeze, leading to pressure buildup that could blow engine seals—a failure the dealer will likely not cover.
• The "Reversible" Strategy: Many Nissan Z owners use "plug-and-play" kits that allow them to remove the catch can and reinstall factory hoses before major service to avoid any potential warranty flags.

 

[Tranzor Z]

Who needs catch cans, just give them the occasional ole Italian tune-up!

I was waiting for someone to say this

 

[Zplz]

I was waiting for someone to say this

Here’s my favorite Italian run. At least until the brutal end.

 

[FSUZ33]

This is a pretty hot Italian runner.

Oh, you said "run"...my bad

 

[G M]

If catch cans worked I'd imagine a car manufacturer would install them. Calling total bullshit on this mod.

What we call catch cans are actually air/oil separators and are used in a lot of gasoline engines.

Folks don't have to believe, but having opened the intake to my ZR1 and found it and the supercharger dripping of oil made me a believer.

As for car manufacturers installing them or not of course most do not. However there is this from Mazda: https://www.hexorcism.com/16ND/sm352774/

And I remember that Chevy put one on the wet sump LT4 used in the Camaro ZL1 but not the Corvette LT4 dry sump for some reason ($). Go to 2:06 on this video to see the Camaro installation.

So yes I installed one on my Z and I drain it at every oil change. So far I've not gotten a lot of oil but then I don't track my cars anymore.