In my opinion a 10K OCI is an "extended OCI". I would never go further than that regardless of the claims made by the oil manufacturer. I believe the longest I've ever gone was approx. 8200 miles and that was after years on BITOG reading about guys doing long OCI's without issues (on synthetic).
Even now I rarely go above 6 or 7K on synthetics.
Having said this I feel this Valvoline EP oil is up to snuff for a 10K OCI for those inclined to do that.
Now that I have 2 GDI engines in the family (14' Focus and 21' CX-30) I'm keeping the OCI's to a maximum of 6.5K....maybe less. I think any synthetic, even the entry level ones, should be good for that OCI. I don't see the point of paying for Castrol Edge EP (gold) or Mobil 1 EP for such a routine OCI. I can't even see paying extra for Supertech 20K syn. over their regular 10K syn. especially since there appears to be little difference in the formula.
Even now I rarely go above 6 or 7K on synthetics.
Having said this I feel this Valvoline EP oil is up to snuff for a 10K OCI for those inclined to do that.
Now that I have 2 GDI engines in the family (14' Focus and 21' CX-30) I'm keeping the OCI's to a maximum of 6.5K....maybe less. I think any synthetic, even the entry level ones, should be good for that OCI. I don't see the point of paying for Castrol Edge EP (gold) or Mobil 1 EP for such a routine OCI. I can't even see paying extra for Supertech 20K syn. over their regular 10K syn. especially since there appears to be little difference in the formula.