KTM likes pushing oil to important parts so their oil distribution and cooling system on the LC4 is more complex than your average tub. It isn't half as hard as what most folks moan about on this topic. If it is too hard take it to a KTM dealer ya pussies! :lol:
A couple of tips I've found to be helpful:
For filling the frame: Get a bottle of gear oil/jack oil from Autozone that comes with a pointed cap.
Dispose of the gear oil (it's usually is under $3) and use the bottle to fill the frame with a quality synthetic. Surround the tip with a shop rag so when it is topped off you don't get oil all over the place. If you are really smart you'll buy the one with a graduated marker on the side so you can put the exact amount you need for the frame (600ml if I recall correctly and 1300ml goes in the crankcase).
For the small filter: Do not remove the oil supply lines as it is unnecessary and will ultimately cause a leak as the fittings require fresh crush washers to properly seal (just like a brake line) if ever removed. Instead remove/loosen the rear brake lever to give yourself plenty of room to get at the area, then remove the filter cover being careful not to damage the gasket. The little cover will swing up out of the way so you can access the filter inside. It is a good idea to clean the outside of the engine before this as it is a tight space and easy to get dirt in there if it is above the filter cover/on the cases.
Buy an SXC instead:
You don't have to do the frame thing but you double the frequency of oil changes.