Now that many of us are working from home and not driving much, we don't put many miles on our cars. For a general purpose vehicle (not a classic or high-performance car, just a daily driver) when would you change the oil? I have three vehicles that went less than 700 miles in each of the last two years. One has synthetic, two have conventional oil. Every year? Every two years? Every three years? Oil still looks clean on the dipstick, seems odd to change it after less than 1000 miles.