The difference between a Magnum capacity and an LA capacity is just oil pan itself, dictated by application. My 1999 Dodge Ram pickup has plenty of room under it for a deep pan to get the away from the rotating assembly and for increased capacity, so it uses something like 6 quarts including a new oil filter. That engine was removed from the truck, pan and pickup were changed to a 4 quart capacity pan that fits an LA engine in an A-body. My capacity is now 4 quarts plus oil filter.
