Remember the oil filter is just as important as the oil. The better it filters, the longer your oil will protect.
The G/F's 2013 WRX, 1st OCI is 3000 & every 7500 OCI there after.
Original Motor/VF-40 Turbo/15k OCI, Amsoil 0w-30 SSO & Ea. oil filters. Tuning Alliance Stage 2+, 18.5psi. Member; 200K + club. Currant mileage:272825