Several Decades Ago, I Switched From Low-Fat Milk To Skim Milk. We Know More About The Health Benefits Now. The Same Is True Of Motor Oil.
These types of changes can be made in steps, like going from 2% butter fat to 1% and then to skim.
Buy your car a nice “blend” oil (part dinosaur / part synthetic) and see how it likes it (keep looking underneath for signs of incontinence). If all is well then make the next oil change full synthetic.
You can always go back to dinosaur oil, but I don’t know why you’d want to do it. I’m never going back to 1% or lowfat milk.
As you have noticed we are in transition right now, moving from old fashioned oil to modern oil and the price difference is decreasing all the time. Your Toyota is a car senior citizen, born in the last century. However, I think it’s a good time for you to come up to the 21st century. I say go for it.
CSA