Oil usage 15 Silvy

[WV_Crusader]

Hey everyone, I have a 15 Silverado 5.3 w/ 80k. I just checked the oil and I’m down 1.5 qts at 50% on the oil life meter. I do run an Elite Eng. Catch Can and get about 1-2ox per fill up in it. 
 

I run Valvoline 0w-20 synthetic with Wix XP but switching over to Amsoil Sig Series next weekend with their oil filter.

 

any help is beyond appreciated!

[Grumpy Bear]

There's only so many ways out of the crankcase and your numbers don't add up for PCV captured v oil lost. The obvious question is do you have a leak. Second would be do you have oil in the air box. That is between the filter and throttle body. You've lost 48 ounces and can only account for about 9 to 12 ounces via the catch system. More than a quart went somewhere. Look for the obvious first. Also remove the oil filler cap and look for moisture or white snot. 

[HighSierraAT]

I have a 14 with the 5.3.  Had something similar happen to mine, my low oil light came on about halfway between services.  I was 1.5-2 quarts low.  I added oil until full and it was another quart or so low by service time. Fortunately I have a friend who works in service and trusted me not to run an oil consumption test and they tore into my engine and discovered all 8 rings on all 8 cylinders were seized shut.  Around the same time, GM had came out with updated pistons and rings for this problem. They put those in my truck, that was around 70k miles.  I'm at 105k and have had no oil usage since.  Also as luck would have it, I was still within my powertrain warranty which covered it all including a loaner for the week. As a sidenote I also started running a catch can and amsoil after that as I plan on running this truck to high mileage.  Hope this helps!

[WV_Crusader]

Thanks for the replies! I have no leaks at all on this truck and even check quite often just because. I have no oil in the intake box or tube. Inside of oil cap is just a normal color and no weird snot or wet from anything other than oil vapor brown.
 

I am debating doing a Amsoil flush because I read of how the rings can seize on these engines. Not that I have reason to believe so.

 

I don’t smell or notice any blueish smoke when the truck starts and idles.

[flyingfool]

, pull a spark plug i doubt this is enough oil to pass the ring to show on the plugs, try a thicker oil next

if the rings are sludging up with burned oil in the lands around the ring area, this could be caused by mixed 0-20w oil thats not "pure" synthetic oil to handle the heat generated around the piston

do a compression test first on all 8 cylinders, get some hard data..

Edited November 16, 2020 by flyingfool

[WV_Crusader]

Thanks will do!