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News: LS7 Valve Guide Wear Issue

Iroc2Vette

Well-known member
Joined
Aug 7, 2013
Messages
89
Location
America
Corvette
2013 Z06 1LZ
I just sent off the oil sample yesterday. The instructions said I could just put it in the envelope and just drop it into any mail receptacle. Hopefully, I'll get a report in the next couple of weeks. I put on a special note that TI and FMPM was of greatest interest due to the valve drop issues of the earlier engines. Don't know if that'll mean anything or not. This should be very telling. It's like doing a blood test on the engine. I had about 8200 miles on the oil. No oil use during this last run.
 

Iroc2Vette

Well-known member
Joined
Aug 7, 2013
Messages
89
Location
America
Corvette
2013 Z06 1LZ
Apex oil analysis arrived

Here are the particulars of the report. Levels of metals and TI elements were extremely low. I received the following:

Sandy,
Please see the attached report for the oil sample that we received. Wear metals and titanium in particular look excellent.
Have a great day

Jason Rainey
Apex Oil Lab
3876 East Paris Ave., SE
Suite 11
Grand Rapids, MI 49512
Toll Free: (844) APEX OIL
www.apexoillab.com

COPY_Q79_2013-Chevrolet-Corvette-Z06-103920_20160113_Merchant-Automotive.jpg
COPY_Q79_2013-Chevrolet-Corvette-Z06-103920_20160113_Merchant-Automotive2.jpg
Looks like all is well after nearly 38K miles. No worries here. I probably do a lot of shortish trips, so that's why my water dilution is a bit on the high side. Other than that, looks like the heads are holding together nicely :beer

I emailed Jason to find out why the TBN durability number was exactly Zero...Seemed odd to me. He wrote back stating it was probably a anomaly in the testing. The only way to tell is to do another sample. Which I won't do for a while. The main thing is the stems and guides aren't grinding themselves to pieces.
 
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Iroc2Vette

Well-known member
Joined
Aug 7, 2013
Messages
89
Location
America
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2013 Z06 1LZ
Latest oil analysis report-blackstone

Sorry it's been a while. This is my latest oil report at about 45K miles. The oil has about 8K miles of use including 5 hours of track time at NJ Motorsports Park. I now have 50K miles on the car. So far, so good. Also attached is a letter from Blackstone concerning the unusually low wear inside the engine.
13 Z06-090716.jpg Re: Oil Report on 13 Z06-090716 (our lab number H79615) - Sandy Mandel.jpg
:beer
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
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Messages
13,452
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CenCoast CA
Corvette
71 04 12 19
From a wear metals standpoint, I'd say your engine is running well. There is no evidence of guid wear and, IMO little, chance of problems going forward..
 
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Iroc2Vette

Well-known member
Joined
Aug 7, 2013
Messages
89
Location
America
Corvette
2013 Z06 1LZ
From a wear metals standpoint, I'd say your engine is running well. There is no evidence of guid wear and, IMO little, chance of problems going forward..

I really hope this is truly the case. My PT warranty ends this coming September, then I'm on my own. I feel fairly comfortable with reasonable care and use of a top quality synthetic lubricant that I can get this engine to run at least a 1/4 million miles...Might have to replace a crank damper or pulley tensioner along the way...but, I really don't expect anything major to happen at this point. If it does, may it happen before this September...
 

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