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#3843371 - 09/05/15 12:37 AM Check UOA on my Corvette: High Lead
Dirty_Howie Offline


Registered: 12/26/07
Posts: 269
Loc: Calif
Car is a 2006 Corvette Z06. I bought it from an old geezer (older than me!). So it wasn't abused. Been putting Redline 5w30 in every 4k miles. Car is a daily driver with 2 Auto Cross days (car would be driven harder on a canyon cruise)

Car uses about 1/3 of a guart every oil change which is pretty good in my experience. The oil pressure is unchanged and very good since I took ownership.

Please give me your input on the lead content !!!



cheers
DH
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#3843373 - 09/05/15 12:45 AM Corvette UA0 with Redline 5w30: High Lead
Dirty_Howie Offline


Registered: 12/26/07
Posts: 269
Loc: Calif
Car is a 2006 Corvette Z06. I bought it from an old geezer (older than me!). So it wasn't abused. Been putting Redline 5w30 in every 4k miles. Car is a daily driver with 2 Auto Cross days (car would be driven harder on a canyon cruise)

Car uses about 1/3 of a guart every oil change which is pretty good in my experience. The oil pressure is unchanged and very good since I took ownership.

Please give me your input on the lead content !!!

Also whats up with the fluctuating Magnesium ??



cheers
DH
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#3843376 - 09/05/15 12:51 AM Re: Check UOA on my Corvette: High Lead [Re: Dirty_Howie]
Benito Offline


Registered: 05/27/15
Posts: 1287
Loc: NY
Redline 5w30 has virgin viscosity at 100c of 11.9cst, HTHSv of 3.7 and NOACK of 6%.

Blackstone didn't seem to realize this.

While your lead is higher than universal averages, your iron is lower.

Maybe change oil. What do GM say you should use? Isn't it M1?

That would certainly get your iron in line with the universal average. hide grin2
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#3843383 - 09/05/15 01:30 AM Re: Corvette UA0 with Redline 5w30: High Lead [Re: Dirty_Howie]
HKPolice Offline


Registered: 03/31/12
Posts: 510
Loc: Toronto, Canada
Looks like main bearing or cam bearing wear. Both contain copper & lead underneath a steel coating. Most likely cam wear because LS engines are known to chew up cams. Worn cam bearings won't cause extra oil consumption, it'll just wear the camshaft out over time.

I'd crack open the valve covers and take a look. If the cams look fine then main bearings = huge PITA.

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#3843394 - 09/05/15 02:32 AM Re: Check UOA on my Corvette: High Lead [Re: Dirty_Howie]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
The car might need a different viscosity or a different oil altogether.

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#3843405 - 09/05/15 04:28 AM Re: Check UOA on my Corvette: High Lead [Re: Dirty_Howie]
LubeLuke Offline


Registered: 05/17/15
Posts: 139
Loc: Austria
Lead at 39ppm is not high.
When you get above 50 ppm then monitor. Above 100ppm indicates there MAY be a problem.
The same for Iron.


Edited by LubeLuke (09/05/15 04:29 AM)

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#3843406 - 09/05/15 04:29 AM Re: Corvette UA0 with Redline 5w30: High Lead [Re: Dirty_Howie]
Cujet Offline


Registered: 02/15/03
Posts: 7144
Loc: Jupiter, Florida
I'd try the obvious. Try a more viscous oil. While it's impossible to predict where the lead is coming from, it could be from highly loaded bearings and insufficient viscosity.

A simple move to a more viscous oil of the same type and brand, followed by another UOA may be illuminating.

In years past, highly loaded CSB's performed very well on oils heavier than what you are using.

Your engine develops it's higher power through increased displacement. Creating higher bearing loads. a GM press release that says the pistons themselves are 482 grams and the rods are 464 grams. I don't know if they reciprocating weights are more than the LS3, but I suspect they are. This would also lead to increased bearing loads.
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#3843462 - 09/05/15 07:41 AM Re: Corvette UA0 with Redline 5w30: High Lead [Re: Dirty_Howie]
Greasymechtech Offline


Registered: 07/11/14
Posts: 1544
Loc: Paradise of Florida
http://www.lingenfelter.com/mm5/merchant...tegory_Code=C54

http://aviaid.com/shopsite_sc/store/html/access-z06-ls7.html

http://www.drysump.com/LS7%20Installation%20Instructions.htm

Redline is pretty thick and not skimping on additives.

Too ways to go thicker, thicker oil or cooler oil.
I'd try the later larger sump(GM 2009+ tank) or the LPE version above. I don't see the need for the A.R.E system. I would consider the pan trap/baffle from Aviad.

Try Redline 0w40.

What oil filter?
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#3843496 - 09/05/15 08:38 AM Re: Check UOA on my Corvette: High Lead [Re: Dirty_Howie]
Falken Offline


Registered: 07/30/12
Posts: 2630
Loc: Montreal, QC, Canada
After reading up just now that Pennzoil Ultra Platinum 0W40 has a NOACK of 13, I just can't recommend Pennzoil products anymore.

I would seriously pull out the Big Guns and go Amsoil SSO 0W40 for two OCIs and get another oil report.

http://www.amsoil.com/shop/by-product/mo...etic-motor-oil/

I just don't think Red Line is working out on your car. And yes I agree with others the 30wt might be too thin!


Edited by Falken (09/05/15 08:43 AM)
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#3843499 - 09/05/15 08:40 AM Re: Corvette UA0 with Redline 5w30: High Lead [Re: Dirty_Howie]
chrly919 Offline


Registered: 01/11/13
Posts: 71
Loc: Tennessee
What's wrong with using what GM specs; Mobil 1 5W30? I use that in my 93 LT1 and my 2001 LS1. It's a LOT cheaper than Redline at Walmart. You can't check 'cams' bearings by removing the valve covers. There's only one cam, it's in the block. Never heard of them chewing up bearings.
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#3843544 - 09/05/15 09:30 AM Re: Corvette UA0 with Redline 5w30: High Lead [Re: chrly919]
Ramblejam Offline


Registered: 11/05/13
Posts: 3210
Loc: Kentucky
Originally Posted By: chrly919
What's wrong with using what GM specs; Mobil 1 5W30?


In the land of BiTOG, where every single PPM matters, other oils have consistently shown lower wear numbers in GM small-blocks. Red Line is not one of those, however.


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#3843553 - 09/05/15 09:48 AM Re: Corvette UA0 with Redline 5w30: High Lead [Re: Dirty_Howie]
btanchors Offline


Registered: 04/10/04
Posts: 761
Loc: Herndon, VA
Dirty:

I don't know a thing about Corvettes, so I cannot speak to the lead content. But you also asked about the magnesium. I'm pretty sure this is from a prior oil that had significant amounts of magnesium in its additive package. For some reason, magnesium is one of those additives that takes several OCIs to completely "wash out" of the engine. The fact that it is progressively lower with each UOA shows this.

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#3843556 - 09/05/15 09:55 AM Re: Corvette UA0 with Redline 5w30: High Lead [Re: Cujet]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18150
Loc: Dallas,Tx USA
Originally Posted By: Cujet
I'd try the obvious. Try a more viscous oil. While it's impossible to predict where the lead is coming from, it could be from highly loaded bearings and insufficient viscosity.

A simple move to a more viscous oil of the same type and brand, followed by another UOA may be illuminating.

In years past, highly loaded CSB's performed very well on oils heavier than what you are using.

Your engine develops it's higher power through increased displacement. Creating higher bearing loads. a GM press release that says the pistons themselves are 482 grams and the rods are 464 grams. I don't know if they reciprocating weights are more than the LS3, but I suspect they are. This would also lead to increased bearing loads.


^^This. GM now specs 15W50 if tracked or raced. You'd mentioned tacking your car to the track twice.
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#3843802 - 09/05/15 03:23 PM Re: Corvette UA0 with Redline 5w30: High Lead [Re: chrly919]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: chrly919
What's wrong with using what GM specs; Mobil 1 5W30?


That's fine if you're just driving your car to the grocery store at 35 mph, but this guy is racing his Corvette.

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#3843818 - 09/05/15 03:42 PM Re: Corvette UA0 with Redline 5w30: High Lead [Re: aquariuscsm]
Ramblejam Offline


Registered: 11/05/13
Posts: 3210
Loc: Kentucky
Originally Posted By: aquariuscsm
GM now specs 15W50 if tracked or raced. You'd mentioned tacking your car to the track twice.


Are you just parroting information that applies to C7's...or do you actually have a document that shows this as GM approved for a '06 Z06?

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