I'm Preparing For My 100,000 Mile Check Up On My 2000 Disco Ii, What Would Be An Optimal Oil To Use With This Milage? I'm Using Pensoil 10w 30 High Milage Now. Iv'e Recieved Some Feedback From Co-workers And Such But I'm Courious What Other Rover Enthusiast Are Using.i've Owned My Lr For 7 Months Now And Have Done 3 Oil Changes Using This Oil.