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Oil Catch Can - is it needed?

Willys2Gladiator

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After seeing the crap it catches I'm glad that junk isn't getting sent into the intake.
Yeah it's most likely harmless but still.
I'm sure at least we're not causing any harm by not letting the motor ingest this oily water crud.
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Renegade

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After seeing the crap it catches I'm glad that junk isn't getting sent into the intake.
Yeah it's mostly harmless but still.
I'm sure at least we're not causing any harm by not letting the motor ingest this oily water crud.
I agree, and may install one at some point to catch oil overflow when climbing at extreme angles. I’ve had this happen to me 3 times over the past year and a half, and it causes an annoying and embarrassing oil smoke cloud. To put the amount collected during street operation into perspective though, consider this:
Even if all the water collected isn’t condensation which occurred within the cooler aluminum can itself (which some likely is), the Mishimoto can designed for the 3.6 holds 3 ounces. If people are finding them 1/2 full after 2,000 miles, they likely have 1.5 ounces of liquid in them. That’s .00075 of an ounce collected per mile. Even if the liquid is entirely water (which it isn’t), that’s about 1/2 of a single drop of water being burned per mile. While it’s not something you necessarily want in your engine, it’s also not likely to cause any damage or performance reduction at all.
 
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Uparms

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Not watching a Scotty Kilmer video. He’s a nut job! If you buy in to his rhetoric, you should immediately sell you Jeep (his recommendation).
Yes, a lot of the stuff is a little off the wall, just passing on what I saw about the need for the can on some bad engines. I can't speak to what engines don't need it. He was just one I stumbled on in my AM You Tube travels.
 
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Uparms

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Willys2Gladiator

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After 512 miles.
Harmless? Most likely but I choose not to have it go into my intake.
It's mostly water mixed with oil due to the consistency.
PXL_20210117_223932580.jpg
 

Willys2Gladiator

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Looks like mostly oil to me, because it’s black.
Black but really runny and not thick like oil. Definetly has oil mixed for sure.

People can say what they want about these catch cans but seeing is believing.
 

Renegade

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Black but really runny and not thick like oil. Definetly has oil mixed for sure.

People can say what they want about these catch cans but seeing is believing.
0W-20 oil is pretty runny. When oil mixes with water it will look gray, or what some call milkshake. If you let it sit for a while, the oil and water will separate, with the water sinking to the bottom. Mostly water:

A68B6671-7ADD-4A83-B828-34A31113B4FD.jpeg
 

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Willys2Gladiator

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0W-20 oil is pretty runny. When oil mixes with water it will look gray, or what some call milkshake. If you let it sit for a while, the oil and water will separate, with the water sinking to the bottom. Mostly water:

A68B6671-7ADD-4A83-B828-34A31113B4FD.jpeg
Your correct. Not sure how I forget that. I will let it sit all day and report back tonight if anything separated.
 

Willys2Gladiator

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Yes, there's water inside on bottle. I grab a used empty bottle to drain this stuff in. Also Jeep had 5,400 miles on engine.
 

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If you take an average of like 1.5 ounces of oil per 1000 miles that the can catches. Then an average of 18 miles per gallon, which is 55 gallons of fuel over 1000 miles. You're talking about burning roughly 0.00021094 oz of oil per 1 oz of gas. Or roughly 37 gallons of gas for every one 1 ounce of oil.

That oil is not going to do any harm to your engine. Ever.
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