1974 Mobil 1 Synthetic Motor Oil recommends 25,000-Mile Oil Change Drain Intervals. Briefly...
Mobil, the king of the oil industry, introduced its synthetic oil in 1974. Although its Mobil 1 synthetic motor oil was initially recommended for 25,000 miles/one year service life. Mobil just as quickly backed off to the original equipment manufacturer's standard 3,000-mile recommended drain intervals. WHY? Because shorter oil change intervals allow them to sell more oil.
2005 ExxonMobil Extends Vehicle Oil Change Drain Intervals to 15,000-Miles (2nd Time)
The highly competitive, $3.4 billion U.S. lubricant market has a "new" entry with the potential to upend the sales volume assumptions it has operated under for decades. Following two intensive and secretive years of work, ExxonMobil yesterday unveiled a "new" line of motor oils that offer “guaranteed engine protection” for change intervals of 5,000, 7,500 and 15,000 mile "Extended Performance" (NOTE Mobil also offered 15,000 mile in 1977).