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Could Excessive Blow-By Be Causing Oil in My L5P Intake?I have a 2019 Silverado 2500HD with the 6.6L L5P and around 126,000 miles.I have been tracking an oil and boost issue that I first thought was just a leaking intercooler connection. I noticed oil around one charge pipe boot and slightly inconsistent boost under heavier throttle.I replaced the worn intercooler boot, cleaned the MAP sensor, installed a fresh air filter and smoke tested the charge air system. I found and fixed a small leak at the boot connection. Boost response improved, but after more driving I noticed oil film returning inside the turbo inlet and charge piping. The MAP sensor also started getting dirty again fairly quickly.That makes me wonder if the issue is related to excessive crankcase oil vapor rather than only a boost leak. I am not seeing major oil consumption or obvious turbo noise, but I have not done a proper crankcase pressure test or ruled out blow-by under load.While researching the factory CCV system I came across this crankcase ventilation reroute for 2017-2024 L5P. I am mainly trying to understand the diagnosis before changing anything.How much oil in the turbo inlet and charge piping is considered normal on a higher-mileage L5P?Would you check crankcase pressure and blow-by first, or inspect the turbo compressor side and intercooler for oil buildup?My main concern is fixing the visible oil issue without missing an underlying turbo seal, ring or crankcase pressure problem.What would you test next? |
