I change my oil & filter with synthetic every 5K to be on the safe side.
Am hoping that more frequent changes might prevent rattling cam phasers and turbo seal failures.
My thought is the oil probably doesn't break down that early but dirty oil is likely the culprit for those type of problems. So far so good but time will tell.
I also installed a catch-can which has about 3/4 inch of what appears to be oil thinned with gasoline in it at each oil change. Perhaps it is controversial if this is needed, but after seeing what comes out of it, I think it is good insurance against wear and drivability issues.
What else do you all do for regular/preventative maintenance?
My 4000 mile (3500 to 4500) oil and filter changes also include the following:
Rotate the tires in X pattern, Check tire pressure and reset TPS for new positions.
Look at rotors and remaining brake pad material when wheels are off.
Check and top off all other fluid levels.
Clean, tighten and coat battery terminals and cable connections.
Look over belt and hoses to see if all ok.
Check and lube suspension bushings if needed.
Check and lube power running board mechanisms.
Check front and rear wipers, replace if needed.
General look around underneath for leaking shocks, loose bolts, exhaust system issues, etc.
Document what was done in vehicle maintenance book.