 Today's OE fix from Dorman oil filter housing assembly. Many vehicles today feature plastic oil filter housings that separate from the engine. Good when they're new, but as the mileage piles on, the failures begin. The plastic housings get brittle and distorted from engine temperature and the operating conditions. Overtightening the oil filter cap during service can also lead to problems. The result is often slow leaks to become bigger if unnoticed.