The Castrol Rankings is an index which gives points to players based on every facet of the game.
Each player's performance is measured, giving them a Castrol Index Score.
Then, the player's index score is multiplied by a predetermined weighting based on the importance of the match. (An EPL game is less weighted than a Champions League semi-final match).
Castrol Index Score x Weighting = Castrol Rankings points.
The points total is then added to the previous points over the past 12 months. This is divided by the total minutes the player played over those 12 months and multiplied by 90 in order to derive an average 90-minute score for every player.
(Cumulative Castrol Rankings Points Total / Total Minutes played) x 90
This culminates to each players point total, provided in the following slides.