My daughter’s 2002 Blazer, 4.3 V6, was using about one quart of oil per week. No smoke, no leaks. Changed the oil. 3.5 quarts and one quart of Lucas Oil Stabilizer. 10 days in and no significant loss of oil.
My 91 Chevrolet K1500, 4.3 V6, was smoking like crazy and using oil due to bad valve...