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Unread 01-05-2015, 05:43 PM   #1
maloj2003wj
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3000 miles in catch can language

Just wanted to share this. I'm so glad i decided to empty it this morning. This is in about 3000 miles and 4 weeks.

image-2544102271.jpg

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Unread 01-05-2015, 06:36 PM   #2
Zlartibartfast
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It looks clean enough to put back into the crankcase
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Unread 01-05-2015, 06:58 PM   #3
Aclow33
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I'd use that in a pumpkin pie, it'd add a little "spice" to it.

I check mine every 1000-1500 miles and its usually 1/4 full.

Looks like you should check it more often.
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Unread 01-05-2015, 10:42 PM   #4
maloj2003wj
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I usually check it every oil change and it is about 1/4 full as well. But I guess since it has became colder, there is a lot more condensation that is involved in producing this much byproduct. I will be checking it more often now for sure.
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Unread 01-06-2015, 05:36 AM   #5
Marcus86GLHS
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Quote:
Originally Posted by maloj2003wj View Post
Just wanted to share this. I'm so glad i decided to empty it this morning. This is in about 3000 miles and 4 weeks.

that is a lot of oil!

how many miles are on your engine?

are you sure your PCV valve isn't stuck?

i think something has to be wrong with your engine to push this volume of engine oil through the crankcase ventilation system in 3,000 miles.

i check mine once per year (I only put about 2,000 miles/year on my Hemi WK) and I get about 2 fluid ounces.
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Unread 01-06-2015, 05:39 AM   #6
unobtanium
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I remember the horror stories when I owned an LS1 car. Now I own a HEMI jeep. I have not ever used a catch-can except on a carbureted 5.0 mustang. My LS1, I sold at 149K miles still getting 27+mpg and running strong. My HEMI returns 18-19mpg on road-trips averaging 75mph or so. I know people say that a catch can is "mandatory" on these vehicles, but I have never seen a need for one.
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Unread 01-06-2015, 07:10 AM   #7
jbarrett
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Originally Posted by Marcus86GLHS View Post
i think something has to be wrong with your engine to push this volume of engine oil through the crankcase ventilation system in 3,000 miles.
Welcome to EPA regulations. Chrysler says it's "within acceptable ranges" to lose a quart of oil every 3,000 miles. Crappy piston rings.
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Unread 01-06-2015, 07:14 AM   #8
comptiger5000
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Originally Posted by Marcus86GLHS View Post
that is a lot of oil!

how many miles are on your engine?

are you sure your PCV valve isn't stuck?

i think something has to be wrong with your engine to push this volume of engine oil through the crankcase ventilation system in 3,000 miles.

i check mine once per year (I only put about 2,000 miles/year on my Hemi WK) and I get about 2 fluid ounces.
Judging by color, it's not all oil. Depending on where they're mounted, length of drives, etc. catch cans will pick up a good bit of moisture in cold weather. In the winter, the stuff that comes out of mine is at least 1/2 water most of the time. As a result, it needs emptying much more often than during the summer, where it only accumulates little bits of oil.
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Unread 01-06-2015, 07:42 AM   #9
Marcus86GLHS
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Originally Posted by unobtanium View Post
......I know people say that a catch can is "mandatory" on these vehicles, but I have never seen a need for one.

i would not say a catch can is mandatory, but, for about $100 you get the benefit of maintaining a clean throttle body which helps performance and economy. Without a catch can on a typical Hemi you are likely going to need to service/clean the TB every 25,000 miles, if you want to maintain optimum performance out of your engine.

without a doubt my catch can is trapping small amounts of oil that would have entered the intake tract and degraded performance and driveability. if the catch can was empty every time I checked it I would remove it from the engine.
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Unread 01-06-2015, 10:19 AM   #10
skibum555
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I was looking into the infamous chocolate milkshake issue the other day and a lot of people credit the milky fluid to the oil in the catch can getting mixed with condensation that stems from cold weather and a hot engine bay. unless the milky fluid is coming out of your oil pan then no need to worry. I checked mine the other day and had some mily goop in my catch can I was nervous to say the least. the lxforums have a lot of hemi info that applies to our jeeps.
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Unread 01-06-2015, 12:06 PM   #11
unobtanium
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Originally Posted by jbarrett View Post
Welcome to EPA regulations. Chrysler says it's "within acceptable ranges" to lose a quart of oil every 3,000 miles. Crappy piston rings.
It's not crappy piston rings. I don't know what rings the HEMI uses, but they aren't a problem. It's likely due to the PCV system, 5-20 oil, and the design of the piston being a short-skirt and more prone to rock in the bore (which causes no harm in a proper setup like the HEMI, LS1, etc.).

I also don't believe my HEMI burns anywhere near 1 quart every 3K.

Quote:
Originally Posted by Marcus86GLHS View Post
i would not say a catch can is mandatory, but, for about $100 you get the benefit of maintaining a clean throttle body which helps performance and economy. Without a catch can on a typical Hemi you are likely going to need to service/clean the TB every 25,000 miles, if you want to maintain optimum performance out of your engine.

without a doubt my catch can is trapping small amounts of oil that would have entered the intake tract and degraded performance and driveability. if the catch can was empty every time I checked it I would remove it from the engine.
I have never cleaned my TB. I have seen/read/etc. all about it. My opinion is that at idle, it could cause a bit of issue with idle stability, but at WOT, it should be a non-issue, and then, you have the IAC to consider as well. You can't really clean those. You may lose 1-2hp and similar torque. Maybe. More variance to be had from vehicle to vehicle than from clean to messy TB at WOT and/or cruising.

If it's a big deal, I'd say just replace the TB every 50K miles. It contains things that can't be cleaned that can affect idle quality.
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Unread 01-06-2015, 12:07 PM   #12
unobtanium
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Quote:
Originally Posted by skibum555 View Post
I was looking into the infamous chocolate milkshake issue the other day and a lot of people credit the milky fluid to the oil in the catch can getting mixed with condensation that stems from cold weather and a hot engine bay. unless the milky fluid is coming out of your oil pan then no need to worry. I checked mine the other day and had some mily goop in my catch can I was nervous to say the least. the lxforums have a lot of hemi info that applies to our jeeps.
The atmosphere pulled from the manifold is humid. Look at what comes out the tail-pipe of your vehicle. Put your hand under the pipe's opening. It feels like a pervert breathing on you. Or a dog panting, whichever you prefer. Regardless, it's oil vapor mixing with humidity from the combustion and intake processes.
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Unread 01-06-2015, 12:19 PM   #13
jbarrett
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Originally Posted by unobtanium View Post
I also don't believe my HEMI burns anywhere near 1 quart every 3K.
You don't have to believe - but it's true. My HEMI burns oil and I've taken it to 2 dealers while under warranty. Neither would no anything because they determined it was only losing around 3/4 of a quart approx every 3k miles, and Chrysler told them that the HEMI can burn up to 1 quart every 3k miles and that there was no repair or modification needed (therefore nothing would be covered).

Only point I'm making is that Chrysler is well aware of this engine burning oil - so much so that they've established a threshold between "normal operation" and "an issue".
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Unread 01-06-2015, 09:32 PM   #14
maloj2003wj
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Quote:
Originally Posted by comptiger5000
Judging by color, it's not all oil. Depending on where they're mounted, length of drives, etc. catch cans will pick up a good bit of moisture in cold weather. In the winter, the stuff that comes out of mine is at least 1/2 water most of the time. As a result, it needs emptying much more often than during the summer, where it only accumulates little bits of oil.
That's exactly what I was thinking, i have only 75K on it. And it runs like a charm. In the summer time i barely get a 1/4 of the catch can every oil change.
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Unread 01-07-2015, 03:54 AM   #15
unobtanium
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Quote:
Originally Posted by jbarrett View Post
You don't have to believe - but it's true. My HEMI burns oil and I've taken it to 2 dealers while under warranty. Neither would no anything because they determined it was only losing around 3/4 of a quart approx every 3k miles, and Chrysler told them that the HEMI can burn up to 1 quart every 3k miles and that there was no repair or modification needed (therefore nothing would be covered).

Only point I'm making is that Chrysler is well aware of this engine burning oil - so much so that they've established a threshold between "normal operation" and "an issue".
LS1's were at 1,000mi/quart for failure per GM, IIRC.

Mine burned about 1qt/2K miles until I found an oil it liked (it DRANK 5-30 Mobil 1), and then it went about 1/2 quart every 4K miles with 0-30 German Castrol.

Maybe try a different brand of oil. Mobil 1 is famous for shearing and burning. What are you running? I run Pennzoil Ultra Platinum 5-20 in my HEMI. Works great.
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