CF-4 Diesel Engine Oil Our strengths: 1, health and environmental pollution. 2 with ISO related national standards and international related environmental standards. 3 reasonable price. 4 after-sale service. 5 products of good quality and reliable products are customers. Transcendental cleanness can stop steel sheath polishing and keep high cleanness of engines. Better oxidation stability and heat stability can effectively restrict formation of deposit. Better abrasion resistance can prolong service life.