Kendall Syn Blend is part of the Conoco Phillips family which includes Trop Artic and Motorcraft. They introduced these oils when the new SM/GF4 standards were introduced for their multigrades such as 5w30,5w20 etc. They are not a full synthetic like Mobil 1 but will provide excellent service for all but the harshest conditions, or for exceptionally long OCI's. For the very harsh conditions, or for vehicles that specify a full synthetic (such as Corvette), M1 would be the appropriate choice. Welcome to the forum btw.