Sounds like you made a wise car purchase and plan on keeping it and maintaining it well.My recommendation is looking into oil analysis, price is reasonable, convenient. My car,different make,recommended 10,000 mile oil changes.I do short trips,10,000 miles I had excessive fuel dilution. I learned thru analysis exactly what was going on.Peace of mind,I get my kit thru the Amzoil site,take the empty bottle to my dealer,he gets me a sample at my oil change,I send it in, easy peasy.Something to think about,all the big flleets use analysis. Good luck