T4216 is one high grade gear oil additive package. This grade package reaches the requirement of api gl-5/gl-4/gl-3 grade gear oil and heavy duty industry gear oil as well. With 4.2% dosage gl-5 gear oil have past crcl-42, crcl-37, crcl-33, crcl-60 bench test, match uss-224, amga250.04 requirement.
