Many believe it's BETTER.....

When you think of how they obsess on service, etc, who knows actually....

I use 4 quarts of Castrol dinosaur 20-50W and 1 quart of the super synthetic 10W-60W in my 300hp Supercoupe. 207K miles of abuse attests to the fact that this is OK. That car has innumerable 1/4 mile runs and mucho street racing on it.

I use dino in the family cars, and switch to add 1 quart of synthetic only during Nov to Apr timeframe.

Oil changes pretty much every 2500.

Plenty of other info shows that dino oil is equivalent in lub potential to synthetic in all but extreme heat and I mean extreme. Dino also only begins to show ANY degradation over say 1500 miles.....and it's still well within safe ranges at 3000miles. You could achieve nearly EVERY benefit of less sludge and cleanliness simply by changing dyno oil every 1500 miles.

Your car normally would see bearing temps of say 170 degrees which is NO WHERE NEAR the benefit realized with synthetic. And what goes on your car really first?