Blackstone Oil Results at 240,000 miles: how concerned should I be?

I got my Blackstone results back. The truck has about 240k on it, and is apparently on its second engine according to the PO (he didn't have any documentation). They aren't as bad as they could've been given that I found metal shards on the drain plug, but they're still not great.

The presence of K and Na might indicate antifreeze. Let's hope that was just from when the shop was replacing the knock sensors and installing a new intake gasket. I haven't noticed any coolant loss or overheating.

Of course, the Cu and Fe don't portend well. The thing is, it has strong compression and runs smooth with no knocking. So what could the source of Fe be, if not the cylinder liners or oil rings? I assume the Cu indicates bering wear, which isn't too terrible.

I will look into possible intake leaks, though I'm not exactly sure how to check the intake plumbing for leaks. Checking the air filter will be my first port of call. Any insights or comments are welcome.

In any case, I plan to heed their advice and send in another sample when I het 2,000 miles.

 

Hey neighbor. I'd make sure the intake is in good shape between the filter and engine, no cracks and good connections, and that the air filter seals well. If you had the intake gasket replaced, maybe they cracked something or didn't get something connected back propely. Then make sure all vacuum lines are in good shape. Shavings on the drain plug doesn't sound good, but if it runs strong and no knocking, do what you can to get that silicon number down and see how that affects the other numbers.

 

My plan is to replace the vacuum lines and air filter. If I don't find any obvious leaks, I may eventually have it smoke-tested. I do also get an intermittent rough idle, so I probably do have vacuum leaks.