1984 GMC S15 Pickup Oil Type & Capacity

It depends on the engine: 2D Pickup Extra Cab, 1.9 A, 4WD, M77 uses 5W-30; 2D Pickup Extra Cab, 1.9 A, 4WD, MB6 uses 5W-30; 2D Pickup Extra Cab, 1.9 A, RWD, Automatic uses 5W-30; 2D Pickup Extra Cab, 1.9 A, RWD, Standard, M77 uses 5W-30; 2D Pickup Extra Cab, 1.9 A, RWD, Standard, MB6 uses 5W-30; 2D Pickup Extra Cab, 2.0 Y, 4WD, Automatic uses 5W-30; 2D Pickup Extra Cab, 2.0 Y, 4WD, Standard, M77 uses 5W-30; 2D Pickup Extra Cab, 2.0 Y, 4WD, Standard, MB6 uses 5W-30; 2D Pickup Extra Cab, 2.0 Y, RWD, Automatic uses 5W-30; 2D Pickup Extra Cab, 2.0 Y, RWD, Standard, M77 uses 5W-30; 2D Pickup Extra Cab, 2.0 Y, RWD, Standard, MB6 uses 5W-30; 2D Pickup Extra Cab, 2.2 S, M77 uses 10W-30; 2D Pickup Extra Cab, 2.2 S, MB6 uses 10W-30; 2D Pickup Extra Cab, 2.8 B, 4WD, Automatic uses 5W-30; 2D Pickup Extra Cab, 2.8 B, 4WD, Standard, M77 uses 5W-30; 2D Pickup Extra Cab, 2.8 B, 4WD, Standard, MB6 uses 5W-30; 2D Pickup Extra Cab, 2.8 B, RWD, Automatic uses 5W-30; 2D Pickup Extra Cab, 2.8 B, RWD, Standard, M77 uses 5W-30; 2D Pickup Extra Cab, 2.8 B, RWD, Standard, MB6 uses 5W-30; 2D Pickup, 1.9 A, 4WD, M77 uses 5W-30; 2D Pickup, 1.9 A, 4WD, MB6 uses 5W-30; 2D Pickup, 1.9 A, RWD, Automatic uses 5W-30; 2D Pickup, 1.9 A, RWD, Standard, M77 uses 5W-30; 2D Pickup, 1.9 A, RWD, Standard, MB6 uses 5W-30; 2D Pickup, 2.0 Y, 4WD, Automatic uses 5W-30; 2D Pickup, 2.0 Y, 4WD, Standard, M77 uses 5W-30; 2D Pickup, 2.0 Y, 4WD, Standard, MB6 uses 5W-30; 2D Pickup, 2.0 Y, RWD, Automatic uses 5W-30; 2D Pickup, 2.0 Y, RWD, Standard, M77 uses 5W-30; 2D Pickup, 2.0 Y, RWD, Standard, MB6 uses 5W-30; 2D Pickup, 2.2 S, M77 uses 10W-30; 2D Pickup, 2.2 S, MB6 uses 10W-30; 2D Pickup, 2.8 B, 4WD, Automatic uses 5W-30; 2D Pickup, 2.8 B, 4WD, Standard, M77 uses 5W-30; 2D Pickup, 2.8 B, 4WD, Standard, MB6 uses 5W-30; 2D Pickup, 2.8 B, RWD, Automatic uses 5W-30; 2D Pickup, 2.8 B, RWD, Standard, M77 uses 5W-30; 2D Pickup, 2.8 B, RWD, Standard, MB6 uses 5W-30.

Oil capacity depends on the engine: 2D Pickup Extra Cab, 1.9 A, 4WD, M77 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 1.9 A, 4WD, MB6 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 1.9 A, RWD, Automatic holds 4.0 quarts with filter; 2D Pickup Extra Cab, 1.9 A, RWD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 1.9 A, RWD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.0 Y, 4WD, Automatic holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.0 Y, 4WD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.0 Y, 4WD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.0 Y, RWD, Automatic holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.0 Y, RWD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.0 Y, RWD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.2 S, M77 holds 5.5 quarts with filter; 2D Pickup Extra Cab, 2.2 S, MB6 holds 5.5 quarts with filter; 2D Pickup Extra Cab, 2.8 B, 4WD, Automatic holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.8 B, 4WD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.8 B, 4WD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.8 B, RWD, Automatic holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.8 B, RWD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup Extra Cab, 2.8 B, RWD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup, 1.9 A, 4WD, M77 holds 4.0 quarts with filter; 2D Pickup, 1.9 A, 4WD, MB6 holds 4.0 quarts with filter; 2D Pickup, 1.9 A, RWD, Automatic holds 4.0 quarts with filter; 2D Pickup, 1.9 A, RWD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup, 1.9 A, RWD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup, 2.0 Y, 4WD, Automatic holds 4.0 quarts with filter; 2D Pickup, 2.0 Y, 4WD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup, 2.0 Y, 4WD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup, 2.0 Y, RWD, Automatic holds 4.0 quarts with filter; 2D Pickup, 2.0 Y, RWD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup, 2.0 Y, RWD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup, 2.2 S, M77 holds 5.5 quarts with filter; 2D Pickup, 2.2 S, MB6 holds 5.5 quarts with filter; 2D Pickup, 2.8 B, 4WD, Automatic holds 4.0 quarts with filter; 2D Pickup, 2.8 B, 4WD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup, 2.8 B, 4WD, Standard, MB6 holds 4.0 quarts with filter; 2D Pickup, 2.8 B, RWD, Automatic holds 4.0 quarts with filter; 2D Pickup, 2.8 B, RWD, Standard, M77 holds 4.0 quarts with filter; 2D Pickup, 2.8 B, RWD, Standard, MB6 holds 4.0 quarts with filter.

Most 1984 GMC S15 Pickup owners follow a 5,000–7,500 mile interval with conventional oil, or up to 10,000 miles with full synthetic. Always check the oil life monitor if equipped, and consult your owner's manual — GMC recommends intervals based on driving conditions, not just mileage.

Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1984 GMC S15 Pickup. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.