An engine teardown of the popular 2AZ-FE unit will show why it may fail. For those who are not familiar with Toyota's portfolio, you should know that the 2AZ-FE has been made since 2000 ...

Many owners of the 2006-2008 third-generation RAV4s, which had the 2.4-liter 2AZ FE engine, complained about how frequently they had to replace their oil. Since this might be a piston problem ...