RX-8 (S1) Engine to N/S Oil Cooler PTFE Oil Cooler Line 
When you have a significant oil leak within the confines of the passenger front wheel arch liner, there's a good chance that your oil cooler line has failed due to heavy corrosion. 9 out of 10 times, it is the oil cooler line that runs from the Engine Front Cover, to the Front Left Oil Cooler on the passenger side (RHD Cars). 
This replacement Oil Cooler line serves as a durable replacement; nylon braided, with a PTFE core which allows for some flex, and excellent weather resistance. The size is AN10, and it comes with the necessary adapters for the Front Cover and Oil Cooler to be installed (M18 x 1.5mm).
Thin enough to utilise the standard OEM brackets for security, and has a protective sleeve to prevent friction and offer better resistance to the elements.
Sold as a single replacement, for those who do not want to commit to replacing all of the oil cooler lines. (Which is a labour intensive job!)