Synthetic is also like Dino....comes from an oil well. Just processed to a higher level of purity
Synthetic has higher specifications....higher operating temp and more stable, lower coefficient of friction, etc. Dino oil is getting better and the gap is narrowing...but synthetic also continues to improve
Also, the additive packages are different
All why synthetic costs more
Many higher end vehicles now come with synthetic from the factory and is the only oil
An always and continual debate over the merits vs Dino and IMHO, use whatever you wish and as a minimum follow your OEM’s oil recommendations.
I drive VERY hard and always have. So want the highest spec oil, which is synthetic
Tried extended changes, but no for me. Can tell when the oil charge is ready to be changed. Change around 5K-7K (dependent on which vehicle) and/or when the oil changes color ‘enough’...or when the PSI starts to drop and/or starts to be consumed. Just me and not pushing for others to do so