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· PassatWorld Elder
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28,020 Posts
If it's an old hose, it's become porous. If it's a new hose, the clamp is loose. How old is the rest of the PCV system?
 

· PassatWorld Elder
Joined
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28,020 Posts
Silicone hoses break down over time and can weep oil. They need to be lined to prevent oil from seeping in and most are not. It's an issue on PCV hoses as well as many aftermarket FMIC hoses.
 
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