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2003 deville
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Replaced intake plenum coupler due to P0101 and P01044 codes. The dirty air tube rubber elbow cracked after I changed the intake plenum. I removed the intake plenum again and oil spilled out when I tipped the intake plenum. Why is there oil in the plenum? Is this normal?
What do I do next?
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
The oil/film gets in there through the PCV System. The "dirty" line is connected directly to the passenger side of the manifold. It's normal and not harming anything.

EXCESS oil in the manifold, and excess oil consumption, can be caused by overfilling the crankcase. Your engine takes 7.5 quarts with an oil/filter change. Proper fill level is half way up the hashmarks on the dipstick (xxxxxXxxxxx).
 
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