It's gotta be 10wt or similar and there's only about a spoonful in it - if that. I swapped my oil out to 90wt hypoid before the last meet. I was kinda shocked to see how little stock oil came out. Filling it was a PAIN but well worth the effort. It's a subtle difference, but one that is everpresent. The white Busa is my daily driver/racer and on the street the 90wt oil made a huge difference. From an LSR perspective, there isn't really anything to improve handling wise on the Busa but it did!
To fill, I used one of those plastic cones from a master cylinder bench bleed kit and some clear plastic tubing that I matched to the 90wt oil bottle. I squeezed the bottle while moving the plunger back and forth and did that until the plunger felt smoooooth all the way through. I takes three hands but I did it with two. Quite a feat when you figure in simultaneously drinking coffee and changing the tv from speed to history channels. (I sure miss beer).
