BMW 750li, MB S550, Bentley spur and Escalade platinum
Hi, i have a quession, the manual said we should use 5W30. i have experienced with mercedes C200K before. the manufacturer suggest i should use 5W30 but when i use 10W40, i feel the car run much more better. lower noise... so, what should i put in my Cadillac now. 10W40 ?