Active steering on , active steering off .    Clear oil , dirty oil .
     Active steering is at driver .  Clear or dirty oil is at  car power .
( Someone driver here with AS on and with AS off  have experience about this at drive here . For example  'apex2691' - 'TRA_APEX_' 
   Someone driver here with clear oil and then with dirty oil  he know the difference about this here )
 Final : 
             Best time lap with AS off and Dirty oil ( 11700km )  1:59,969 . Best time lap with AS on and Clear oil ( 2118km )  2:00,50
              I do not know how times is 1 position with AS off   but when car is better with dirty oil  then 1 position is with dirty oil .