It’s my understanding that there should only be a couple of quarts in the engine sump and the rest in the oil tank, cooler, and lines. I think eight quarts in the sump would flood the crank and possibly damage it. As a matter of fact I think the oil coming out of the exhaust is because the sump was so full some leaked past the pistons and ran out of an open exhaust valve. Perhaps the car went into self preservation mode and filled itself with oil so it wouldn’t seize up