When I bought my Tacoma back in 2011, I think, some came with synthetic and some with regular motor oil. The ones with synthetic recommended 10,000 miles while the ones with regular was 5,000. When I bought my Tundra in 2015, it came with synthetic but the recommended mileage was 5,000 miles. I don't quite understand why, as everyone that I have talked to had no problems with the 10,000 miles oil change. miles
I drive a 2014 Tundra Crew 4x4. It came with full synthetic as well, and the rec'd oil change interval is 5000 miles. I was told at the local dealer that does the oil changes that the 2x4's were still 10k, the 4x4's interval is 5k.
