One very common issue on the 4th generation Toyota 4Runner is an oil leak that occurs at the front corner of the passenger side valve cover. Changing out the valve cover gaskets on both passenger and driver sides can be a bigger job, but mainly because it can be a bit overwhelming with the amount of parts you need to disconnect or remove. Therefore, it’s very important to be organized when removing parts and to document everything you take apart. Photos along the way help tremendously in guiding you to put everything back in the right order. I hope this guide helps you if you need to replace the valve cover gaskets on your 4.0L V6 (1GRE-FE) 4th Generation Toyota 4Runner.