07 Chevy Duramax - Rotella T6 5W-40 - 11,916 miles

LateArrivalforLSU

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Originally Posted By: Danno
What's with the high copper reading from sample 6 ?
No idea. Was four years ago, and was my lone sample to ever have a high Cu reading.
 

dnewton3

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What's up, Shawn!?! Long time ... Typically boring Dmax. Yawn ... How much better can a UOA get? thumbsup Some GM vehicles, Dmax in particular, will occasionally see a Cu spike, often attributed to the oil cooler. As long as it settles back down, there is nothing horrid going on.
 

LateArrivalforLSU

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What's going on there Dave?! Yep, a typical ho-hum nothing wrong DMax UOA. I was really excited to see the results from this UOA since it's been such a long time that I've sampled. By the way, what's the TBN of a virgin sample of Rotella T6? Was curious to gauge that against my current TBN numbers.
 

dnewton3

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As I recall the TBN virgin is around 10? but that's based on a Blackstone test. OA may not use the same testing protocol, so a point or more difference isn't a big deal. Overall, plenty of life left in your lube! Really stackin' up the miles, eh?
 
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