Advantages:

New Castrol CRB Turbomax 20W-50 CH-4 contains specially engineered DuraShield TM Boosters that help fight the main causes of engine damage. In severe testing,
Castrol CRB Turbomax 20W-50 CH-4 with DuraShield TM boosters delivers up to twice the engine life.
CRB Turbomax 20W-50 CH-4 with DuraShield TM boosters is proven in industry testing to help provide protection to your engine in two ways:
-Under severe engine operating conditions soot can agglomerate to form large particles which help to displace oil on moving metal surfaces. This results in metal to metal contact. CRB Turbomax 20W-50 CH-4 with DuraShield TM boosters helps to prevent the agglomeration of soot as well as protecting surfaces from wear.
-CRB Turbomax 20W-50 CH-4 with DuraShieldTM boosters provides a protective layer on the moving metal surfaces which resists break down, even under difficult conditions.