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when mine got like that I discovered the upper hose was split on its underside - it's not uncommon tbh.
For some reason my lower has never split, but does like to wear a coating of oil
EGR valve can cause it but usually comes with power loss.
i'd check all the intake system hoses for splits or leaky joins for starters. One thing at a time an' all that!
For some reason my lower has never split, but does like to wear a coating of oil
EGR valve can cause it but usually comes with power loss.
i'd check all the intake system hoses for splits or leaky joins for starters. One thing at a time an' all that!