5-7k miles.

high mileage 5w-20 Penzoil with Mobil1 filters.

I try to hit it at 5k , last time was 7k though because of a last minute trip I made to TN.

Engine oils don't break down like they used too.. i know people with over 220k on their vehicles who do it every 5k, and they are clean as a bell.. no leaks or ticks.