First try your car and see how it feels on the track.
Then you can move from there.
Does it spin a lot?
Which tires?
Do the front wheels spin a lot when exiting a corner and the car doesn't accelarate fast?
Does it understeer,oversteer,...?

BUT first set the suspension right and then mess with diff oils.
Make sure to at around 1 degree toe out at front and around 2-3 toe in at the rear.
NOTE that the rear toe in is very sensitive.MAX 3 degrees.More toe in=less oversteer.