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2006 Silverado 4.8 UOA Peak 5w30 #5283850 12/03/19 10:39 AM
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bigmike Offline OP
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Haven't logged in in a long time, so hopefully I attached the report correctly. I was concerned about some coolant loss with no visible leak found.
This truck has the Castech heads known for cracking. I did change the radiator cap and haven't seen any loss since, but it's still early.
I did pressure tests with a loss of 1 PSI per hour so could be a leak or the tool I have.

Cliff notes:
Truck is a 2006 2WD LT 4.8. 99,500 on the ODO. Peak 5w30 conventional (got from NAPA when it was .99 cents per bottle!). Now I have 5w30 Maxlife Blend in it and will run that for 6 months, then retest.

Copper is typically high in these trucks but was surprised to see it still high after 99k miles. Figured the engine should be broken in by now.


Please give me your feedback if you have any.
Thanks and take care,
Mike

[Linked Image]



Last edited by bigmike; 12/03/19 10:46 AM.

Take care,
-Mike

2006 Chevy Silverado LT 4.8 - Maxxlife 5w30, Purolator One
2009 Honda Accord LX-P 2.4 - Penn Ultra 0w20, Purolator Classic
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5283875 12/03/19 10:57 AM
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JoelB Offline
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I doubt high copper is a result of engine break in, you're long past that point.


Mine: 2019 Chevy spark 1.4 Non-turbo
Mobil 1 0w20 AFE
ACDelco UPF64R

Wife's: 2018 Chevy spark 1.4 Non-turbo
Mobil 1 0w20 AFE
ACDelco UPF64R
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5283879 12/03/19 11:01 AM
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Doublehaul Offline
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Do you have a oil cooler on this truck?


2019 Toyota 4Runner 4x4 TRD
2019 Toyota Tacoma 4x4 TRD*

Mobil 1 0w40


The specs on the back are more important than the label on the front
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5283880 12/03/19 11:01 AM
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Triple_Se7en Offline
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Numbers read pretty subpar oil adds. Stick with the more major brands like Pennzoil, Valvoline, Castrol......etc.


19' Hyundai Santa Fe 2.4 GDI - Valv Syn 5w30 / Napa Proselect filter / 6oz Liqui-Moly
20' Kia Soul X-Line 2.0 Multi-port / Factory-fill oil / filter
04' Colorado 3.5 / Castrol Edge 0W40 / K&N filter
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5283951 12/03/19 12:13 PM
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ad244 Offline
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Pretty unimpressive oil honestly. Copper is definitely high after 3,000 miles.

Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5284023 12/03/19 02:04 PM
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JohnnyJohnson Offline
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Pretty impressive for a Chevy V8 compared to most of what I see on here.


2004 Corolla 137480
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 76862
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5284042 12/03/19 02:22 PM
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dogememe Online Content
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I'm too lazy to Google what years had the defective heads? Would my 01 5.3 have this issue?


2010 Ford Escape 2.5 ~102K Miles: Castrol Magnatec 5W-20, Wix Filter.
2001 Chevy Suburban 5.3 ~290K Miles: Unknown Oil, Filter.
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: Doublehaul] #5284321 12/03/19 06:50 PM
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bigmike Offline OP
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Originally Posted by Doublehaul
Do you have a oil cooler on this truck?


Yes, and that's my other thought about high copper. I've heard some oils cause more copper leeching than others but I have no proof.


Take care,
-Mike

2006 Chevy Silverado LT 4.8 - Maxxlife 5w30, Purolator One
2009 Honda Accord LX-P 2.4 - Penn Ultra 0w20, Purolator Classic
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: dogememe] #5284326 12/03/19 06:53 PM
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bigmike Offline OP
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Originally Posted by dogememe
I'm too lazy to Google what years had the defective heads? Would my 01 5.3 have this issue?


As far as I understand, yes. Castech 704 I believe. You can see the 704 on the head. It's still rare but there was definitely a bad run off heads. Worried me enough to send in for a UOA. Saved me from pulling the valve covers. Lots of info out there if you wish to pursue it.

Mike


Take care,
-Mike

2006 Chevy Silverado LT 4.8 - Maxxlife 5w30, Purolator One
2009 Honda Accord LX-P 2.4 - Penn Ultra 0w20, Purolator Classic
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: Triple_Se7en] #5284468 12/03/19 09:26 PM
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Doublehaul Offline
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Originally Posted by Triple_Se7en
Numbers read pretty subpar oil adds. Stick with the more major brands like Pennzoil, Valvoline, Castrol......etc.


Seriously?


2019 Toyota 4Runner 4x4 TRD
2019 Toyota Tacoma 4x4 TRD*

Mobil 1 0w40


The specs on the back are more important than the label on the front
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: Doublehaul] #5284546 12/04/19 12:23 AM
Joined: Jul 2005
Posts: 12,580
dave1251 Offline
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Originally Posted by Doublehaul
Originally Posted by Triple_Se7en
Numbers read pretty subpar oil adds. Stick with the more major brands like Pennzoil, Valvoline, Castrol......etc.


Seriously?



Every few months he chimes in with worthless advise.


make the inside of your engine oil cap white.
don't use.
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5284589 12/04/19 03:38 AM
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Mad_Hatter Offline
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You're loosing it from somewhere (duh) and it could very well be the oil cooler. If you investigated the particle size of the copper you could ascertain where it's most likely coming from (for example, bearings v. oil cooler) as different parts shed different size particles. I forget the name of the test, something like "stain gram" or other, dunno. Fortunately coppers a soft metal so it's not going to promote wear and as long as your other wear metals aren't abnormal there's nothing to set your hair on fire about. So BS is right in this regards - just keep an eye for any developing trends.

This article about copper might be of interest to you... interestingly, changing of oil brands/formulas can initiate a "spike" in copper levels. Read article to learn more about that phenomenon.

https://testoil.com/data-interpretation/sources-of-copper/

*otherwise a pretty unremarkable report, which is a good thing.😉

Last edited by Mad_Hatter; 12/04/19 03:41 AM.
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: Mad_Hatter] #5284640 12/04/19 06:22 AM
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bigmike Offline OP
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This is a fascinating read that let me to think about my use of MOS2. I told Blackstone that I used about 1/3 of a can on this oil change, which I completely forgot to mention here and they didn't reference in their comments.

If this article is correct about sulfur possibly attacking copper parts, this could be why it is high. If so, I plan to discontinue using it.

What are your thoughts?

Thanks,
Mike


Take care,
-Mike

2006 Chevy Silverado LT 4.8 - Maxxlife 5w30, Purolator One
2009 Honda Accord LX-P 2.4 - Penn Ultra 0w20, Purolator Classic
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: bigmike] #5284713 12/04/19 08:04 AM
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dave1251 Offline
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Originally Posted by bigmike
This is a fascinating read that let me to think about my use of MOS2. I told Blackstone that I used about 1/3 of a can on this oil change, which I completely forgot to mention here and they didn't reference in their comments.

If this article is correct about sulfur possibly attacking copper parts, this could be why it is high. If so, I plan to discontinue using it.

What are your thoughts?

Thanks,
Mike



I would never use MOS2 in anything I cared about. But this is just me. Plus were did it go because nothing in the UOA is abnormally high additive wise. Most of the MOS2 is likely stuck to the oil pan.


make the inside of your engine oil cap white.
don't use.
Re: 2006 Silverado 4.8 UOA Peak 5w30 [Re: dave1251] #5284726 12/04/19 08:27 AM
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Posts: 3,250
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bigmike Offline OP
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Originally Posted by dave1251
Originally Posted by bigmike
This is a fascinating read that let me to think about my use of MOS2. I told Blackstone that I used about 1/3 of a can on this oil change, which I completely forgot to mention here and they didn't reference in their comments.

If this article is correct about sulfur possibly attacking copper parts, this could be why it is high. If so, I plan to discontinue using it.

What are your thoughts?

Thanks,
Mike



I would never use MOS2 in anything I cared about. But this is just me. Plus were did it go because nothing in the UOA is abnormally high additive wise. Most of the MOS2 is likely stuck to the oil pan.


Well in regards to where did it go? That's a great question and I found it a bit disappointing when I received the UOA.

I've hashed out MOS2 in multiple threads many years ago here, some seemingly as long as a classical novel. In those conversations, I never heard anything negative about the sulfur component but I'm not a chemist so I don't know how it breaks down nor what circumstances it may do so.


Take care,
-Mike

2006 Chevy Silverado LT 4.8 - Maxxlife 5w30, Purolator One
2009 Honda Accord LX-P 2.4 - Penn Ultra 0w20, Purolator Classic
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