I have a Toyota truck and the recommended oil from Toyota per specs is synthetic.gotta be careful on some of those "synthetic" brands..
Toyota's synthetic is made by Mobil, which when i had managed a Mobil service station, it was introduced....like over 40 years ago, before i left that job, and got into trucking.
back then, it was 1 year or 20,000 miles you would change it.
BUT...once you changed from dino oil to synthetic, you could not go back...
and if your engine was a leaker..??
best to not ever go synthetic back then
that was way back then, it may not be true anymore.