Oil Consumption
#1
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Oil Consumption
So yeah..
My 4.8 running royal purple had quite a bit of oil consumption 160K miles.
I swapped in a 5.3 with 45k miles, still running royal purple, and I am seeing a 1.5 qt loss at 2k miles.
I do alot of stop and go traffic driving.
What about you guys?
My 4.8 running royal purple had quite a bit of oil consumption 160K miles.
I swapped in a 5.3 with 45k miles, still running royal purple, and I am seeing a 1.5 qt loss at 2k miles.
I do alot of stop and go traffic driving.
What about you guys?
#2
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i had the same problem. I found i had so much vacuum in my crankcase it was sucking oil/vapors through the intake. It would literally suck the oil cap on when you try to take it off. I restricted my breather line to the intake to about an 1/8" hole and my oil loss went away completely. I would use probably a quart every 1000-1500, now i lose none. Maybe not your problem but its worth checking out.
#3
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i had the same problem. I found i had so much vacuum in my crankcase it was sucking oil/vapors through the intake. It would literally suck the oil cap on when you try to take it off. I restricted my breather line to the intake to about an 1/8" hole and my oil loss went away completely. I would use probably a quart every 1000-1500, now i lose none. Maybe not your problem but its worth checking out.
#4
PT's Slowest Truck
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The LS style engines are known for oil excessive suction through the PCV system. Do a search for "catch can" and you should find a good solution for what may be the cause of your oil consumption problem, that will leave the PCV system intact and functioning as it should
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There are supposed to be new design valve covers available to allow splashed oil to drain from the valve cover baffles to keep it out of the PCV system. I am putting a set on a G8 this week. I'll let everyone know what they look like soon.
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my pcv system still works fine, it was just sucking far too much in the crankcase, i just restricted it to an acceptable vacuum. I think a catch can is just band-aiding the problem of too large of a hose, and lack of a valve that would usually restrict the suction because of the smaller orifice inside the valve. I think a catch can is better suited for FI guys that actually have a problem with too much positive crankcase pressure, not too much suction.
#10
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my pcv system still works fine, it was just sucking far too much in the crankcase, i just restricted it to an acceptable vacuum. I think a catch can is just band-aiding the problem of too large of a hose, and lack of a valve that would usually restrict the suction because of the smaller orifice inside the valve. I think a catch can is better suited for FI guys that actually have a problem with too much positive crankcase pressure, not too much suction.
Originally Posted by GMCtrk
no oil consumption on my 143k mile 4.8 or my 82k mile 6.0
I've always thought that maybe a better baffle system in the valve covers would be a good fix, maybe my thinking was right according to the info that white lightning SS posted about the re-designed valve covers. I wonder if they'll clear aftermarket rocker arms...