I have a 98 Chevy Prizm with the 1.8 toyota engine, I've never worked on a toyota engine. Today I changed the oil on the car for the first time, everything went smoothly until I took off the oil cap to pour the new oil in, to my suprise there isn't just a hole you pour oil into the engine but there is a piece of metal inside the hole and it took forever to pour oil into the engine, I had to pour it very slowly and wait for it drain around the metal and into the engine. Is this normal with this engine? Why is there metal directly across under the fill hole? I've never seen this before. By the way the dealer put (5) quarts of oil in the car (I have the paperwork), I only put about 400 miles on it before I changed it and put in the correct 3.9 quarts with filter..any possible engine damage? Thanks for the help.