Description: 4.6L. Allante. 4.9L, california. All models. 4.9l. At manifold. Aurora. Detects oxygen content in the exhaust gases to help optimize emissions This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

Description: All models. 7.4l. With 7.4L, gas. 4.6L. Express, savana. 7.4l. Seville. 3.5l. Aurora. 4.3L, cpi. Helps provide a leak-free seal Allows exhaust pollutants to enter the engine for re-burn Helps the engine emission system operate properly This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

Description: Helps remove moisture and sludge build up in engine oil

Description: 4.6L. Allante. Calif. All models. 4.9l. At manifold. Aurora.