Kinetic curves of RP, SP and AP for diesel and lubricating oil. The square symbol means diesel, the uptriangle means lubricating oil. The oil sorption capacity of RP for diesel and lubricating oil are the black line. Also, AP and SP are the blue line and red line, respectively. RPD: Oil sorption capacity of RP for diesel; RPL: Oil sorption capacity of RP for lubricating oil; SPD: Oil sorption capacity of SP for diesel; SPL: Oil sorption capacity of SP for lubricating oil; APD: Oil sorption capacity of AP for diesel; APL: Oil sorption capacity of AP for lubricating oil.