the type of oil recommended is 5w30, at an oil change the capacity is 4.2qt.
how do you know when valve lifters for 94 mercury villager 3.0 engine r bad
No, it's not.
The 3.0 litre V6 engine in a 1994 Mercury Villager has a timing BELT
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According to the ( 1996 ) Mercury Villager Owner Guide : With engine oil filter change : The 3.0L V6 engine takes ( 4.2 U.S. quarts / 5W-30 PREFERRED )
3.9 exactly
4 and a half
The 1994 Mercury Villager has a 3.0 litre V6 engine from the factory : ( it has 6 engine cylinders )
5W-30 is the preferred oil ( according to the 1996 Mercury Villager Owner Guide )
The engine is fuel injected so it doesn't have a carburetor
You cannot stop an oil leak without knowing what is leaking. Take your car to one of those car-wash places that steam cleans engines. Clean the motor right down, you should now be able to locate your leak easily.
supply, return, and vapor collection.