Catch can fills up quickly

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Donnyd21

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I have a 2015 Yukon, 5.3, I installed a catch can and it fills up rather quick, about 1oz every 100 miles, that’s a lot of oil it would just burn if I didn’t have this installed. It that normal for these? The oil in it smells and looks just like that, oil, no hint of other contamination like water vapor. I’ve just been pouring it back into the oil. I will mention I have DoD turned OFF in my tune.
 
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Donnyd21

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I definitely have it hooked up correctly. I’m starting to think it’s normal with all the oil burning complaints on the Gen V’s.
 

STORMIN08

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Apple to Oranges comparison.

really ?

other than a possibility of high compression ratios, the rings allowing that much oil to pass is unacceptable. the shear lack of firing the cylinder is allowing excessive amounts of oils to hang on the walls. where as a fired cylinder seating the ring aids greatly in scraping oil back down below the rings.
 

Captain Insaino

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My LS1 Camaro only puked into the can on high RPM accelleration/decellerations. I don't know a lot about these trucks, but is your PCV valve stuck open? Do you have a high idle? Something causing high block pressure? How many miles?
 

ivin74

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I have a 2015 Yukon, 5.3, I installed a catch can and it fills up rather quick, about 1oz every 100 miles, that’s a lot of oil it would just burn if I didn’t have this installed. It that normal for these? The oil in it smells and looks just like that, oil, no hint of other contamination like water vapor. I’ve just been pouring it back into the oil. I will mention I have DoD turned OFF in my tune.


How many miles are on your rig?
is your PCV valve stuck open? Do you have a high idle? Something causing high block pressure? How many miles?

X2
 
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Donnyd21

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113k miles. Removing the oil fill cap during idle shows no excessive crankcase pressure. Normal idle rpm.the PCV is integrated into the valley cover, no idea how to check if it’s stuck open on these
 

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