1998 Chevrolet Cab & Chassis Oil Type & Capacity

It depends on the engine: C2500, 5.7 K uses 5W-30; C2500, 5.7 R, Automatic uses 5W-30; C2500, 5.7 R, Standard uses 5W-30; C2500, 6.5 F, Automatic uses 10W-30; C2500, 6.5 F, Standard uses 10W-30; C2500, 7.4 J, Automatic uses 10W-30; C2500, 7.4 J, Standard uses 10W-30; C3500, 2D Pickup, 5.7 K uses 5W-30; C3500, 2D Pickup, 5.7 R, Automatic uses 5W-30; C3500, 2D Pickup, 5.7 R, Standard uses 5W-30; C3500, 2D Pickup, 6.5 F, Automatic uses 10W-30; C3500, 2D Pickup, 6.5 F, Standard uses 10W-30; C3500, 2D Pickup, 7.4 J, Automatic uses 10W-30; C3500, 2D Pickup, 7.4 J, Standard uses 10W-30; C3500, 4D Pickup, 5.7 R, Automatic uses 5W-30; C3500, 4D Pickup, 5.7 R, Standard uses 5W-30; C3500, 4D Pickup, 6.5 F, Automatic uses 10W-30; C3500, 4D Pickup, 6.5 F, Standard uses 10W-30; C3500, 4D Pickup, 7.4 J, Automatic uses 10W-30; C3500, 4D Pickup, 7.4 J, Standard uses 10W-30; K2500, 5.7 K uses 5W-30; K2500, 5.7 R, Automatic uses 5W-30; K2500, 5.7 R, Standard uses 5W-30; K2500, 6.5 F, Automatic uses 10W-30; K2500, 6.5 F, Standard uses 10W-30; K2500, 7.4 J, Automatic uses 10W-30; K2500, 7.4 J, Standard uses 10W-30; K3500, 2D Pickup, 5.7 K uses 5W-30; K3500, 2D Pickup, 5.7 R, Automatic uses 5W-30; K3500, 2D Pickup, 5.7 R, Standard uses 5W-30; K3500, 2D Pickup, 6.5 F, Automatic uses 10W-30; K3500, 2D Pickup, 6.5 F, Standard uses 10W-30; K3500, 2D Pickup, 7.4 J, Automatic uses 10W-30; K3500, 2D Pickup, 7.4 J, Standard uses 10W-30; K3500, 4D Pickup, 5.7 R, Automatic uses 5W-30; K3500, 4D Pickup, 5.7 R, Standard uses 5W-30; K3500, 4D Pickup, 6.5 F, Automatic uses 10W-30; K3500, 4D Pickup, 6.5 F, Standard uses 10W-30; K3500, 4D Pickup, 7.4 J, Automatic uses 10W-30; K3500, 4D Pickup, 7.4 J, Standard uses 10W-30.

Oil capacity depends on the engine: C2500, 5.7 K holds 5.0 quarts with filter; C2500, 5.7 R, Automatic holds 5.0 quarts with filter; C2500, 5.7 R, Standard holds 5.0 quarts with filter; C2500, 6.5 F, Automatic holds 7.0 quarts with filter; C2500, 6.5 F, Standard holds 7.0 quarts with filter; C2500, 7.4 J, Automatic holds 8.0 quarts with filter; C2500, 7.4 J, Standard holds 8.0 quarts with filter; C3500, 2D Pickup, 5.7 K holds 5.0 quarts with filter; C3500, 2D Pickup, 5.7 R, Automatic holds 5.0 quarts with filter; C3500, 2D Pickup, 5.7 R, Standard holds 5.0 quarts with filter; C3500, 2D Pickup, 6.5 F, Automatic holds 7.0 quarts with filter; C3500, 2D Pickup, 6.5 F, Standard holds 7.0 quarts with filter; C3500, 2D Pickup, 7.4 J, Automatic holds 8.0 quarts with filter; C3500, 2D Pickup, 7.4 J, Standard holds 8.0 quarts with filter; C3500, 4D Pickup, 5.7 R, Automatic holds 5.0 quarts with filter; C3500, 4D Pickup, 5.7 R, Standard holds 5.0 quarts with filter; C3500, 4D Pickup, 6.5 F, Automatic holds 7.0 quarts with filter; C3500, 4D Pickup, 6.5 F, Standard holds 7.0 quarts with filter; C3500, 4D Pickup, 7.4 J, Automatic holds 8.0 quarts with filter; C3500, 4D Pickup, 7.4 J, Standard holds 8.0 quarts with filter; K2500, 5.7 K holds 5.0 quarts with filter; K2500, 5.7 R, Automatic holds 5.0 quarts with filter; K2500, 5.7 R, Standard holds 5.0 quarts with filter; K2500, 6.5 F, Automatic holds 7.0 quarts with filter; K2500, 6.5 F, Standard holds 7.0 quarts with filter; K2500, 7.4 J, Automatic holds 8.0 quarts with filter; K2500, 7.4 J, Standard holds 8.0 quarts with filter; K3500, 2D Pickup, 5.7 K holds 5.0 quarts with filter; K3500, 2D Pickup, 5.7 R, Automatic holds 5.0 quarts with filter; K3500, 2D Pickup, 5.7 R, Standard holds 5.0 quarts with filter; K3500, 2D Pickup, 6.5 F, Automatic holds 7.0 quarts with filter; K3500, 2D Pickup, 6.5 F, Standard holds 7.0 quarts with filter; K3500, 2D Pickup, 7.4 J, Automatic holds 8.0 quarts with filter; K3500, 2D Pickup, 7.4 J, Standard holds 8.0 quarts with filter; K3500, 4D Pickup, 5.7 R, Automatic holds 5.0 quarts with filter; K3500, 4D Pickup, 5.7 R, Standard holds 5.0 quarts with filter; K3500, 4D Pickup, 6.5 F, Automatic holds 7.0 quarts with filter; K3500, 4D Pickup, 6.5 F, Standard holds 7.0 quarts with filter; K3500, 4D Pickup, 7.4 J, Automatic holds 8.0 quarts with filter; K3500, 4D Pickup, 7.4 J, Standard holds 8.0 quarts with filter.

Most 1998 Chevrolet Cab & Chassis 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 — Chevrolet 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 1998 Chevrolet Cab & Chassis. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.