WHAT DOES JDM MAZDA RX-7 FD 13B-REW ENGINE FOR SALE MEAN?

Exterior oil leaks within the Mazda RX-7 FD are a result of worn-out oil seals and O-rings that crack resulting from aged age. This hardly ever happens, but checking the oil degree regularly even though inspecting for leaks is good considering that they are able to go undetected, resulting in oil starvation.Or big difficulties for instance apex sea