Castrol 5w-40 or Mobil1 0w-40 - PistonHeads
I don't know what the best oil to put in the 987 Boxster S is... A new oil by Castrol is meant to be good from what I hear and 5w-40 is a better choice than 0w-40. But a lot of people swear by Mobil1. Can anyone please advise? OR...