sorry noob here, whats the different using fully synethic and mineral oil ?
Mineral oil are refined from oil from the earth. Synthetic oil is man made oil. made in the lab.
All modern EO are designed for modern car engines and are designed to last more than 10k km of continuous usage, with a typical shelf life of 3 to 5 years.
Synthetic oil remain more stable at high operating temperature and oxidise less than mineral oil. You change oil because of the oxidation which form sludge, something that u dun want in your engine. All EO will degrade, but Synthetic, less so.
For normal cars, there is no additional benefit to use synthetic oil since mineral oil are designed to work within the operating temperature of the engine. in high performance engine like turbo-charged engines, you have to go fully synthetic because the engine will produce more heat and friction. Mineral oil will degrade very fast in that environment.
For normal sedans, semi- synthetic oil which is a blend of mineral and synthetic is already the optimal type for normal sedans. dun need to waste money and go fully synthetic.