[Chef-j]

Originally Posted by Martinjlm

This is almost exactly what I was told by the Chief Engineer for the Small Block V8 (includes LT1 and LT4). He stopped short of saying it would cause damage, but did say it would void my warranty and that there were much better ways to spend my money. I asked him about it before I bought my 2017 LT1 Vert as I approached my retirement from GM.

Do you think he will tell you “Yes, you will need it!” They will will never recommend any aftermarket parts to anyone. Why? No one wants take responsibility if something happens.

[Chef-j]

Running catch can here. I can take this off in 5 mins if i need to go dealer. Lol

[Silverado57]

Originally Posted by fullpower

I feel like Michael Corleone when he got back from Cuba and Tom was afraid to tell him Kay had a misscarige:

Can’t anyone give me a straight answer anymore!!

OK, that right there is pretty funny!

[Fraxum]

LOL OP don't worry about your warranty with a catch can. Also if you track (drag racing or road tracking) then the catch can is a good idea. But if not I wouldn't bother. While the idea that DI engines are a bit oil and carbon build up challenged and deposits can accumulate is true, has anyone here had that problem yet? Chevy has spent some engineering to prevent the problem.

[18ss376]

Originally Posted by Chef-j

Running catch can here. I can take this off in 5 mins if i need to go dealer. Lol

Finally someone that gets it...LMAO!

[Martinjlm]

Originally Posted by Chef-j

Do you think he will tell you “Yes, you will need it!” They will will never recommend any aftermarket parts to anyone. Why? No one wants take responsibility if something happens.

I absolutely do. He is a good friend of mine since we have worked together for many, many years.

[Martinjlm]

Originally Posted by Chef-j

Running catch can here. I can take this off in 5 mins if i need to go dealer. Lol

And that should be the move for anyone who wants to use a catch can and is not already 100% in with their dealer. As I said, most dealers could give a damn and would welcome the warranty work.

As long as there is not a tune involved there's nothing that will tell GM about the modification. But if for some reason the dealer says they'll charge you for work because you have a mod, GM will support the dealer on that. Clearly this is more likely with mods requiring a tune or otherwise detectable by reading the ECM.

[Airfuel]

Originally Posted by Chef-j

Running catch can here. I can take this off in 5 mins if i need to go dealer. Lol

Unless your car shits the bed on the road and you have to have it towed to the dealer....just saying.

[Whocares05050]

Originally Posted by Airfuel

Unless your car shits the bed on the road and you have to have it towed to the dealer....just saying.

Its is literally a 90 degree hose with easy fittings...

Your'e right though. The 1 in .0000000009 chance it happens lol

[94boosted]

Very first thing I did on my car was order a JLT Catch Can. Installation takes <10min.

Originally Posted by Whocares05050

I am convinced this forum is full of idiots...

"Not good for your motor"

"Could cause damage"


Its a f*cking oil seperator, not a 300 shot of nitrous. Gooooood lord some of you need help.

This x100

Originally Posted by hotlap

Catch cans have the potential to prevent your crank case ventilation from functioning properly. The ventilation removes combustion blow by gases that will condense back to gasoline in your crank case oil. Elevated crank case pressure can also blow seals.

If you drive the car in very cold climates it's inevitable that it will catch more condensation and therefore require more frequent draining. I had a catch can on my 2015 GMC Sierra with the 5.3 DI V8 and in the spring/summer/fall I only needed to drain the catch can once every 2-3 months, however in the winter I needed to drain it at least once a month. I'm in Canada and we get some very cold weather here (-30°F).

If you forget to drain your catch can and/or it freezes up you could potentially have issues with a higher crankcase pressure. So if you do get one you have to periodically drain it.

[Chef-j]

Originally Posted by Airfuel

Unless your car shits the bed on the road and you have to have it towed to the dealer....just saying.

[Chef-j]

Originally Posted by Martinjlm

As long as there is not a tune involved there's nothing that will tell GM about the modification. But if for some reason the dealer says they'll charge you for work because you have a mod, GM will support the dealer on that. Clearly this is more likely with mods requiring a tune or otherwise detectable by reading the ECM.

I agreed

[TOP WHOP]

Originally Posted by fullpower

We need an engineer's explanation of how exactly a catch can will in FACT cause problems that would not be covered under warranty.

[hotlap]

Originally Posted by 94boosted

If you drive the car in very cold climates it's inevitable that it will catch more condensation and therefore require more frequent draining. I had a catch can on my 2015 GMC Sierra with the 5.3 DI V8 and in the spring/summer/fall I only needed to drain the catch can once every 2-3 months, however in the winter I needed to drain it at least once a month. I'm in Canada and we get some very cold weather here (-30°F).

If you forget to drain your catch can and/or it freezes up you could potentially have issues with a higher crankcase pressure. So if you do get one you have to periodically drain it.

My can filled with water in four days!

The Mishimoto can is small so I was checking it every two weeks in order to get a sense of its needs. Nothing dramatic until the temps dropped into the teen and then I found it completely full. Obviously, I was very concerned but the oil looked ok so I emptied the can and checked it four days later. That is the picture I posted (about 1/3 full). At that point I decided to remove the can and change the oil. The oil reeked like gasoline so bad the garage smelt like I spilt gas on the floor.

I don't think the water in the can would freeze due to other things mixed in. Not sure though because my garage stays in the 40s regardless of outside temp and that is were I checked it.

This is why I won't run my car with one and can understand GM not approving their use. It requires owner involvement for things not to go bad and they havn't tested them to validate.