Conventional oil is pumped out of the ground and refined, while synthetic is chemically modified petroleum that’s produced at a factory. Most new cars call for synthetic oil, although some still ...

Using full-synthetic in a well-maintained engine rarely causes problems. Both synthetic and conventional oil starts out as crude oil. However, not all crude oil is the same. According to the U.S ...

Got a question about cars? Write to Car Talk write to Ray in care of King Features, 628 Virginia Drive, Orlando, FL 32803, or ...

The brand offers two lines: Pro Performance conventional oil and SYN Full Synthetic oil. While STP makes excellent products that represent good value for your money, its performance-based motor ...

What would be better or best concerning the interval between oil changes using 5W30 synthetic oil versus regular 10W30 or 10W40 oil? My vehicle is a 1996 Ford Ranger with 143,000 miles on it.