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High silicon where to look

Series 60 d dec4. My silicon usually runs about 4-8. My last two oil samples have been around 25. I've checked the air filter, air box, and all the connections between the air box and turbo. What else should I check? Could a leaking charge air cooler or the intake manifold gasket be the problem. Any help on how to test or troubleshoot this problem would be greatly appreciated.

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checking cac and intake is a good place to start. i have found any time the valve cover comes off silicon goes up. Recent overhead?

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First off.. Great name. I have not done a recent overhead. The last 3 samples,every 10,000 miles, have all come back with silicon over 25. Do you know how to test the air intake manifold? I tested the charge air cooler and it has no leaks. Thanks for the help.

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Rick will be eternally grateful.
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