Motoring Chronicle on MSN

Is synthetic oil really worth the extra cost over conventional?

Synthetic oil is worth the extra cost for most drivers. It lasts 7,500 to 15,000 miles between changes compared to 3,000 ...
Jalopnik

Semi-Synthetic Vs. Synthetic Blend Oil: Are They The Same Thing?

Motor oils are broadly categorized into fully synthetic, conventional, and synthetic blends (also called semi-synthetic or part synthetic), with semi-conventional and high-mileage full synthetics ...