There are many manufacturers of oil filter manufacturers around the world、Here are a few well-known ones:

1、Parker Hannifin: A leading global manufacturer of filtration systems and products, including oil filters.
2、Donaldson Company: A renowned manufacturer of filtration systems and products, including oil filters for industrial, automotive, and aerospace applications.
3、Mahle: A German-based company that produces a wide range of filtration products, including oil filters for automotive, industrial, and marine applications.
4、Mann Filter: A German-based company that specializes in the production of high-quality filters, including oil filters for automotive and industrial applications.
5、Wix Filters: A US-based company that manufactures a wide range of filters, including oil filters for automotive, industrial, and heavy-duty applications.
6、Bosch: A German multinational company that produces a range of filtration products, including oil filters for automotive and industrial applications.
7、MANN+Hummel: A German-based company that produces a wide range of filtration products, including oil filters for automotive, industrial, and marine applications.
8、Fram Group: A US-based company that specializes in the production of filters, including oil filters for automotive and industrial applications.
9、Schenck Process: A global company that produces a range of filtration products, including oil filters for industrial applications.
10、Eaton: A US-based company that produces a range of filtration products, including oil filters for industrial, automotive, and aerospace applications.

These are just a few examples of the many oil filter manufacturers out there、There are also many smaller, specialized manufacturers that produce high-quality oil filters for specific industries or applications.

If you're looking for a specific type of oil filter or a manufacturer that serves a particular industry, feel free to let me know and I can try to provide more targeted information!