• It can be the pressure built up in the crankcase. overfilling it with oil can also cause this. A simple solution is to replace the PVC. The most likely is worn piston rings causing blow-by.
    • TBO
      With air? LOL I misread this joke post.
    • The Original Mixed-Up Kid
      Someone else asked "Why does my air filter keep filling with oil?". Since both oil filters and air filters exist, I thought I'd ask the reverse of that other question and nobody would think it was nonsensical. Lol:)
    • RareCatch
      You got the air filter and oil filter mixed up.

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