10,085 miles and 5 months to the day on Harvest King 10W-30 syn with a Bosch Premium 3422 filter. 2002 Ford Ranger, 3.0L Vulcan V6, right at 250k miles. Holds 5 quarts of oil. Added 0.5 quarts during this OCI. This was my third run on the same oil/filter combination, last two OCIs were 7.5k and I decided to try 10k. I may step up to 12k but we will see. Clearly, anything less than 10k in my application is overkill. My driving was about 70% highway and 30% around town. This is the Warren-sourced HK syn. Has been discussed extensively here, suffice it to say it is by far the cheapest SN+/D1G2 syn available in my area.