Does anyone know how I can tell what size my engine is? I don't have an owner's manual for it.

Its a 1.5L.

there are some 1.8 DEs, but more than likely its a 1.5 like he said. easiest way to figure this out is to look at the exhaust manifold, if its 4 individual runners almost equally spaced its 1.8, if they look like 2 big runners or 4 runners spaced 2 and 2 its 1.5. OR if its has spark plug wires running to the front of the motor from the side of the motor its a 1.5. 1.8s are distibutorless and its plugs on the back side through the valve cover.

Thank you very much.