Motor oil gets dirty over time, that's just a fact of driving. The best line of defense is a good 2011 Toyota Prius oil filter to trap oil contaminants in the filter media and provide cleaner oil to the engine. Old filters can cause all sorts of problems: overheating, low oil pressure, and dirty exhaust. That's why your owner's manual specifies a service schedule for when to replace this part. If it's time for finding replacement oil filters for 2011 Prius, browse our selection and find the right part at the right price.