Where do you get the mix for the oil for the train in resident evil 3?

In Resident Evil 3, you can find the mix for the oil needed to operate the train in the "Raccoon City Park" area. Specifically, you'll need to combine the Oil Filter and the Oil in your inventory. The Oil Filter is often located in a nearby storage area, while the oil can be found in various locations throughout the game. Once combined, you can use the mixture to fuel the train and progress in the story.