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04 Civic, 85k miles (this is an old sample, motor has 98k miles now). Aftermarket cone air filter. Zero oil consumption - no oil added. Amsoil 0w20

Originally Posted By: Smokefan1977 Do realize the article is from 9/99. I wouldn't hold much stake in the article at point. Resample next OCI!! I don't think chemistry has changed over time. If you read the article, it explains why copper is used as an additive in bio oil, and it's very necessary.

Originally Posted By: Torrid If copper is abrasive, what benefit is there in using it as an additive? There's a difference between copper that has shed off parts in your engine, and soluble copper additives.

I'm a newb, so go easy if this has been discussed. I switched to RLI 10w30 HD in my LS7 and the UOA looked great, but copper spiked. The previous oil was Castrol Edge (it did well too). Here is an article that explains why...

Here's an interesting article on why RLI uses copper as an additive: http://www.copper.org/publications/newsletters/innovations/1999/09/oil.html

Originally Posted By: Colt45ws What are you running now? I'd like to see it again after a few runs on the RLI. Same oil (RLI). I'm about to change for a fresh supply of the same.

With shipping I paid $9.47/qt. I agree that it didn't show a substantial improvement over the Edge (that would be nearly impossible since the Edge numbers were already very low). But even so, the wear numbers were down using the RLI (copper excepted). The reason for experimenting is that some...

Here's a message I received from someone who uses this oil regularly: Hi Mark, Copper is an anti-oxidant, and RLI usually has around 100 ppm, so your 82ppm is fine, maybe even low (could be [censored]'s equip didn't detect it all or calibration is different than what I'm used to seeing, and...

The person that recommended this oil to me told me copper was an additive, and he showed me his report that showed even higher copper levels. The only copper in the engine would be in the main, cam and rod bearings. If they are wearing, I'd assume lead would also be very high, which isn't. The...

The previous UOA was Castrol Edge 5w30.

Standby. Let me see how I can do this.

Street driven like last time. Very similar except the copper is high (I heard it's an additive in this oil?), and the TBN and viscosity are fantastic.

Originally Posted By: 09_GXP Any date codes from the engines? I am curious is maybe there might be a link there. Any ideas on the duty cycles of the engines that had failures? The sodium filled valves rely on higher rpm to allow sodium to move around. There hasn't been enough (or any...

I will, I posted the first one using Castrol Edge. The latest is using RLI 10w30 HD. Should have the results by the end of the week.

Thanks. I was hoping that it could. The LS7/Z06 community has had some alarming exhaust valve failures (it's a two piece, sodium filled stainless valve) and in all circumstances the iron guides are excessively worn. Some that haven't experienced any failure have discovered during a head swap...

Can a UOA register wear metals caused by valve guides wearing? Specifically, the exhaust valve guide, which also has an oil seal. Thanks Mark

I put 3700 miles on Castrol Edge 5w30 in my 09' Z06 LS7 and the UOA showed excellent wear metals count too, the exception was the viscosity took a dive to 54.7. It basically turned into a 20w oil. I have a 10.5 qt dry sump capacity and big oil cooler. Not sure why it did that. I've moved on to...

Glad to hear the comments that the engine and oil are doing well. Thanks!

I have mixed feeling on this oil. While the wear metals speak for themselves, I didn't track the car and get the oil temp up. With a 10.5 qt capacity and oil cooler, the oil temp rarely gets above 180F, and struggles to get above 150F in the winter. 10w30 in this brand would likely be better in...

I replaced it with the same since I had already bought in bulk. Next oil change will be Renewable Lubricants 10w30 HD. I know the viscosity dropped off, but the wear metals look excellent. Fe looks great, which was a concern since there are some LS7's that are experiencing early valve guide wear.