I have a 06 chevy siverado v8 and have posted my used oil analysis here and noticed a lot of these motors with high copper output regardless of mileage, my question is where is it coming from ? Bearings, vale guides, Is there something new GM has in these engines that we don't know about?Last time I checked, Copper was in main and rod bearings, and if it's down to the copper already what's the deal?
High Copper in GM v8's
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I don't know where it comes from, but GM V-8's have been doing it for years. Does not seem to hurt anything.
?Wrist pin bushings?
Here is a link for a GM engine/copper
http://neptune.spacebears.com/cars/stories/copper.html
Here's an excerpt
"Far and away the most likely candidate for copper shedding seems to be the engine's cam and crank bearings. The number three crank bearing, in fact, was designed specifically "to minimize the effect of thermal growth differences between the aluminum block and iron crankshaft." In other words, it's got a tough job: if the block and crank disagree on clearances, this bearing loses. Bearing wear is also consistent with enthusiasts' observations when they tear down their engines.
Our guess proved close. At an SAE conference this year, we met up with an R&D engineer from General Motors. He checked into the copper issue for us, and the answer is: the camshaft bearings. They shed copper during break-in (and apparently they take a while to break in, eh?). It's normal and won't cause any problems."
http://neptune.spacebears.com/cars/stories/copper.html
Here's an excerpt
"Far and away the most likely candidate for copper shedding seems to be the engine's cam and crank bearings. The number three crank bearing, in fact, was designed specifically "to minimize the effect of thermal growth differences between the aluminum block and iron crankshaft." In other words, it's got a tough job: if the block and crank disagree on clearances, this bearing loses. Bearing wear is also consistent with enthusiasts' observations when they tear down their engines.
Our guess proved close. At an SAE conference this year, we met up with an R&D engineer from General Motors. He checked into the copper issue for us, and the answer is: the camshaft bearings. They shed copper during break-in (and apparently they take a while to break in, eh?). It's normal and won't cause any problems."
I think this is why UOA are used for trending, not comparison to other motors. "High copper in all GM V-8s" is "the average copper you will find in a GM V-8"
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