That information is in your owners manual (try page 327) along with a lot of other very useful information. If you don't have one, order one through your Toyota dealer or get one online. It's very likely you'll learn your Solara has a lot more to offer than you're aware of. To answer your question, the 6 cylinder 3MZ-FE engine takes exactly five-quarts or 4.7L of oil when changing oil and filter. Cheers