SAE 15W-50 aviation ashless dispersive multigrade oil for use in aircraft piston engines operating under severe and very severe conditions all year-round and in any climate.

Total 15W-50 contains an anti-wear additive similar to TEXTRON Lycoming LW 16702 so it is not neccesary to add this to your oil.  This means that the correct proportion of additive is always present without measurement when adding oil to the engine.