Gates Engine Oil Filler Cap P/N:31103
The Gates 31066 oil & lubrication components for the 1997-2002 Jeep Wrangler 2.5L and other vehicles is a twist-lock engine oil filler cap that closes the engine's oil filler opening.
Oil residue around the cap or a seal that looks cracked or flattened can mean the cap is worn, though a leaking valve cover gasket or a clogged PCV valve can leave oil there too, so find the cause before you replace the cap. The fitment calls for one cap per engine.
It also fits the 1987-2002 Dodge Dakota 2.2L / 2.5L / 3.9L / 5.2L and the 1991-1997 Jeep Cherokee 2.5L. If your vehicle isn't named here, look it up by year and engine in the "Vehicles it fits" section.
Fit and size
Build and materials
One oil filler cap with a gasket or seal.
Product information is for general reference and may contain errors. See our Disclaimer.
Does the Gates 31066 oil filler cap fit a 1997-2002 Jeep Wrangler 2.5L?
Yes. Gates 31066 fits the 1997-2002 Jeep Wrangler 2.5L, and it also fits the 1991-1997 Jeep Cherokee 2.5L.
Does the Gates 31066 oil cap come with a seal?
Yes. Gates 31066 comes with a gasket or seal, so the cap ships with its sealing piece.
What are the neck and shell sizes on this twist-lock oil filler cap?
The neck diameter is 1.18 in and the shell outside diameter is 2.25 in. Cap neck depth is 1 in, and the closure is a twist-lock cam.
What material is this oil filler cap made of?
It is made of steel and rubber. A special finish resists corrosion and protects against high under-hood temperatures.
How do I tell if the rubber seal on my oil filler cap has worn out?
With the engine off and cool, look for a cracked, hardened or flattened seal, or oil residue around the cap. A shop can trace the cause if oil keeps seeping.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.