Anyone else seen these marks on their original tanks?
Car is a 02B LOS build and tank has 5 D 7 (fifth week of 67) date code stamp.
(https://linkpro.net/piwigo/i.php/upload/2020/07/13/20200713193137-2cce31ff-xx.jpg)
That's from the steel company marking for the raw steel used to manufacture the tank.
Thanks 67cruisemaster, I'm glad it isn't something specific to the car because the marks didn't survive cleaning the tank.