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i believe the manual recommends a 10k or 1 year normal OCI. You have a huge sump At 9 quarts.I wouldn’t hesitate 7500-10k depending on the nature of use.With the 9qt capacity of my LS460, Costco full syn at $25 per 10qt is a no-brainer, but being that the additive pack is probably on the low end of the spectrum, how far could I comfortably stretch out the OCI?