While many people choose to use welding cable, it IS true that generally they are not oil resistant rated.
I will use either the cable for McMaster Carr which IS oil rated, or perhaps even this stuff…it is from a high end aftermarket car stereo accessory manufacturer…in fact, the same one that makes the battery terminals that Genos is selling. The 4/0 wire is NOT that much more then the 2/0 that McMaster sells, and furthermore it IS tinned OFC copper, ULTRA fine strand and ULTRA flexible, oil rated.
http://www.knukonceptz.com/mobile-a...kolossus-fleks-red-40-gauge-powerground-wire/
http://www.knukonceptz.com/mobile-a...lossus-fleks-black-40-gauge-powerground-wire/
It is NICE wire!!!
They even do sell 4/0 connectors, bunt I think I will use a copper crimp connector instead.