And now, the rest of the story: An update on increased levels of copper in oil

After my Nov. 3 column, “”Why are there increased levels of copper in my oil?”" was published, I received some valuable advice from industry experts on the subject.

After doing further research, here’s the rest of the story: First of all, the column was on the mark, but I feel I may have been off base pointing out the brand of oil that may have explained the reason for the increase in the copper level according to the oil analysis. The phenomenon of higher copper in the oil cannot be attributed to a specific brand of oil. The condition is not brand specific, but is more than likely a result of an oil additive used as an anti-scuffing agent.

If you use the Lycoming additive, part number LW-16702, or any brand of oil that contains this or a like substance, it may not be unusual to see a slight increase in copper levels when you conduct an oil analysis. It’s been noted that this occurs when the changeover is made from oils not incorporating the anti-scuffing agent.

The slight increase in copper levels usually diminishes in 100 hours or so. Experience tells us that this is a transient effect and will have no impact on engine life.

Paul McBride, recognized worldwide as an expert on engines, retired after almost 40 years with Lycoming. Send your questions to: AskPaul@GeneralAviationNews.com.

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