Phillips 66 Lubricants announced that it has extended its product quality guarantee to protect heavy-duty fleets against lubricant-related failure in the engine when using Guardol FE 10W-30.

Source: https://www.prfree.org/@hooverallie/buy-10w30-engine-oil-guardol-fe-synthetic-blend-diesel-engine-oil-86kp4n6nakr4