LOL, obviously you're right and I you've gone off on a tangent, misinterpretating my comment of lightweight. I meant less equipment so the car overall lighter - light is right when racing after all.
Jason, with respect, remove the blinkers, look at the car again and apply the following physics lesson to diff oil :
Expansion and Contraction in Liquids
- When liquids are heated, their particles move around more, pushing each other apart slightly, causing the liquid to expand and contract by predictable amounts based on their temperature,
- This is because the particles in liquids are not held in a fixed arrangement, as they are in solids, so this increased freedom of movement results in greater expansion.
- As with solids, the expansion and contraction of liquids needs to be allowed for in certain situations eg car radiators are connected to an overflow tank to allow for the expansion of coolant as it is heated by the engine