Basically the deeper section is usually at the front, but the problem is the crossmember on the E36 hits it, along with the steering rack. So just means you have to cut it back to a flange, then fab up an ally replacement so the deeper section is at the back closer to the bellhousing. I've kept the shallow section deep enough to allow the standard dipstick to function normally, and made the larger part deeper to increase overall capacity (they don't hold much oil as standard). Also added a baffle and better sump plug point. The good thing is the oil pump is internal to the block, and you just have a pick up pipe that comes down - so with the new sump its just a matter of making up a longer tube from the stock pickup to the new location at the back.
As good as F4Rs are... I wont ever have another! Il update once ive got it mounted, not really had time to sort it with it p*ssing down 24/7 recently!