2007 Subaru Outback 2.5L NA 207,000 miles. Oil changes mostly conv. or semi-synth from several shops. 5-7k OCI's. My mothers car, I do the oil changes and maintenance myself now though. One owner. Piston slap is real bad now when starting, especially in the winter, I can hear it rattling through the neighborhood well after it's left the driveway. Been run below the dipstick many times, my family does not believe checking oil is important no matter what I say.