Brian you and I work the same way I aim for 7.5 k for my oil and filter change, and I will confess to using top quality oil every time and an additive every 4th change.
Regardless of mileage the oil is changed every six months.
A useful tip if you hang around the pits for F1 or endurance racing the guys in the lube centres like Petronius and Mobile will usually give you a mass spec print out for free. Hope I have not cooked my goose by saying this.
Alan
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