Dave,

This is just my personal experience. My shop 1984 S-10 has close to 270 k miles on its little 2.8 V-6, my Wifes 1984 Riviera just hit 140k, and my 99 Tahoe 5.7 just turned 70k. Every one of them has been fed 5W30 Mobil one since thier first oil change.... Login to read more.