Medium and Heavy Trucks
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Thanks for asking your question and requesting me. I will try and help you out.
With only 100K miles there should not be much blow by. It's normal to have some but not a lot. With this low of miles, I would not suspect cylinder wear. There are two other things that can cause blowby.
The first is a worn air compressor. They have Pistons and cylinders too. If they wear. It will elevate blowby.
Second is a faulty turbo. Sometimes they can fail and allow exhaust to travel down the oil drain back tube and elevate blowby.
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