Roger - not sure that NAPA numbering thing is 100% across the board, but every WIX/NAPA filter I've had has cross referenced that way.

My fall out with Castrol has been with vehicles that never used a drop of oil between changes suddenly starting to need 1, 2 or more in the same period of mileage. Then changing over, no longer used any again. That had happened on several vehicles. Is it bad oil? Of course not. But I've just had less then good experiences and more then once