valley cover on intake and pcv valve failure lead to oil in my intake. Replacing both seemed to cure them problem not sure yet.
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Newest reported 2002 Toyota Avalon problems
Sludge can build up in the engine because Toyota did not recommend frequent enough oil changes. Lexus will sometimes offer a discount on cleaning the engine if necessary. Owners who changed their oil every 3,000 miles did not experience these problems. This sludge build up can lead to excessive oil consumption.