Oil for 5.3L to reduce consumption

RLC2020

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My 2015 5.3L Yukon recently started burning oil after I switched to penzoil UP. I've owned the truck for 10k miles now (at 63k currently, purchased with 53k). The first oil (done at dealership where I bought it) went 4500 miles without burning more than 1/2 quart. I added a JLT catch can, but would mostly just dump the oil back into the valve cover since it was very clean looking. I had a free oil change so that was done at dealer again and no issues. 1200 miles ago I changed the oil myself using an OEM filter and Penzoil Ultra Platinum 0-20w oil. I used this in all my previous vehicles and had great luck with it, always seemed to make the engines run quieter and smoother. That said, I've added 2.5 quarts since I changed the oil 1200 miles ago. I couldn't believe it, but after adding 1.5 quarts after 500 miles I then needed to add another quart at 1100 miles. Now at 1200 it's showing near the bottom of the safe zone again.

It is not leaking, I've checked over every inch of the undercarriage and it's bone dry, no drops under the vehicle in the driveway either. I'm not noticing any blue smoke and the truck is running fine(ish). It stumbled the other day and threw a code for cyl 7 misfire, but it went away immediately and has been fine other than that.

Any suggestions? I'm assuming these 5.3's don't like penzoil UP perhaps, what should I do?
 

swathdiver

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My 2015 5.3L Yukon recently started burning oil after I switched to penzoil UP. I've owned the truck for 10k miles now (at 63k currently, purchased with 53k). The first oil (done at dealership where I bought it) went 4500 miles without burning more than 1/2 quart. I added a JLT catch can, but would mostly just dump the oil back into the valve cover since it was very clean looking. I had a free oil change so that was done at dealer again and no issues. 1200 miles ago I changed the oil myself using an OEM filter and Penzoil Ultra Platinum 0-20w oil. I used this in all my previous vehicles and had great luck with it, always seemed to make the engines run quieter and smoother. That said, I've added 2.5 quarts since I changed the oil 1200 miles ago. I couldn't believe it, but after adding 1.5 quarts after 500 miles I then needed to add another quart at 1100 miles. Now at 1200 it's showing near the bottom of the safe zone again.

It is not leaking, I've checked over every inch of the undercarriage and it's bone dry, no drops under the vehicle in the driveway either. I'm not noticing any blue smoke and the truck is running fine(ish). It stumbled the other day and threw a code for cyl 7 misfire, but it went away immediately and has been fine other than that.

Any suggestions? I'm assuming these 5.3's don't like penzoil UP perhaps, what should I do?
How about the stuff that was made for your truck?

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RLC2020

RLC2020

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I get that, my question is do I have something seriously wrong internally, or are these engines very sensitive to what oil is run in them. In my Hemi Ram trucks they made all sorts of valve noise with the stock mopar oil so I switched to the penzoil UP as suggested by everyone on that forum.

Just like everyone on this forum recommends switching trans fluid to Amsoil instead of the "stuff that was made for it"...
my question is, is there a specific oil that is best for the 5.3, or does that not matter and I actually have an issue with the motor?
 

swathdiver

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I get that, my question is do I have something seriously wrong internally, or are these engines very sensitive to what oil is run in them. In my Hemi Ram trucks they made all sorts of valve noise with the stock mopar oil so I switched to the penzoil UP as suggested by everyone on that forum.

Just like everyone on this forum recommends switching trans fluid to Amsoil instead of the "stuff that was made for it"...
my question is, is there a specific oil that is best for the 5.3, or does that not matter and I actually have an issue with the motor?
I don't think so. Change oils and consider sending off a sample to Blackstone Labs for analysis.

My engine would rattle in the morning on start up when running Mobil One. After switching to ACDelco's oil it stopped doing it and gas mileage improved a tad. The engine only consumes oil when it is regularly revved above 3000 rpms. Such as when my wife drives it! it consumes no oil when I drive it. LOL
 
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RLC2020

RLC2020

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I'm going to dump the penzoil out and refill with OEM and see what happens. Seems like a lot of consumption to not have a trail of blue smoke behind me. Not sure where it's all going, but I'll see if AC Delco oil makes a difference.
 

THarber

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The Penzoil is Dexos approved so there should not be any issue with it. However, I find that my truck runs and sounds so much better with Royal Purple. My Vette, wants Mobile 1, so go figure. You might even consider bumping up to 0w-30w. I'm in Florida so the added weight keeps my psi up in the summer heat.
 

swathdiver

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The Penzoil is Dexos approved so there should not be any issue with it. However, I find that my truck runs and sounds so much better with Royal Purple. My Vette, wants Mobile 1, so go figure. You might even consider bumping up to 0w-30w. I'm in Florida so the added weight keeps my psi up in the summer heat.

That's thing, it seems like the motors each have a brand that works best for them as they wear in. Kinda like a rifle having its preference for shooting bullets most accurately.
 
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RLC2020

RLC2020

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I was considering going up to 0-30 or even 5-30. I'm on the Space Coast of FL and it's already into the 90's here. I know these modern engines are rated for 0-20, but it just seems so thin to me. I'm fine with loosing 0.5 mpg to have better engine protection if heavier oil would provide it.
 

swathdiver

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I was considering going up to 0-30 or even 5-30. I'm on the Space Coast of FL and it's already into the 90's here. I know these modern engines are rated for 0-20, but it just seems so thin to me. I'm fine with loosing 0.5 mpg to have better engine protection if heavier oil would provide it.
What you don't want is for the thicker oil to slow down the timing events for the AFM system if still active. I know the Corvette guys switch oil to go road racing. Might want to look into that more for your Gen V LT engine.

Wife and kids were up there this weekend for a bridal shower with family, gorgeous weather they said. Many used to work for NASA and Boeing.
 

Rygrego

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I was considering going up to 0-30 or even 5-30. I'm on the Space Coast of FL and it's already into the 90's here. I know these modern engines are rated for 0-20, but it just seems so thin to me. I'm fine with loosing 0.5 mpg to have better engine protection if heavier oil would provide it.
I've run 5w30 in my 2016 Yukon since its first oil change and lose zero between changes. You will not see a mileage drop I can assure you.
 

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