Some here may argue that this has been discussed ad nauseam, and a subset of them will just revert to the classic "read the manual" response, regardless. Well, the Toyota maintenance schedule has first oil change at 10,000 miles/1 year, except for severe service 5,000 miles/6 months. "ToyotaCare" covers oil change at 10K and 20K. I have read about how our engines have an initial "break-in" period before leaving the plant, justifying this.
But I'd rather see raw data. Since there don't appear to be any recent threads still open on this topic, to contribute to the global knowledge database I have shared two early "baseline" used oil analyses here.
Frankly I do regret (just a little bit) not doing the first oil change earlier. I know there isn't anything necessarily problematic here, but the idea of abrasive break-in material recirculating for that long doesn't set well with me.
Notes:
But I'd rather see raw data. Since there don't appear to be any recent threads still open on this topic, to contribute to the global knowledge database I have shared two early "baseline" used oil analyses here.
Frankly I do regret (just a little bit) not doing the first oil change earlier. I know there isn't anything necessarily problematic here, but the idea of abrasive break-in material recirculating for that long doesn't set well with me.
Notes:
- I'd estimate the duty cycle split (in terms of mileage) 1/3 highway, 2/3 city.
- The bulk of the "city" driving was from trips approx. 25-30 minutes in duration.
- First sample taken at 3425 miles / 151 hours
- Second sample taken at 4676 miles / 205 hours
- Oil was NOT changed at first sample. Second sample was taken upon changing oil (but not filter), including the addition of the "polar vortex" with a couple cold starts below -20°F
- Yes, the second sample did arrive before the first sample. USPS had it for close to 8 weeks.