I'd leave it in there for 5K unless you do ALOT of city driving and if you do that, change it at 3K. Just my opinion here, but Castrol isn't the best oil out there. I'd go with either Mobil 1 or Valvoline Synthetic and leave it in there for about 7,500K or more, depending again on how/where you drive. Don't forget to spend a couple extra dollars on the synthetic filter, only the best for your baby
