TDK Driver-train Oil took many months to get right, its a medium thick oil that has extremely high levels of additives to provide protection to high wear areas such Axles, CVAs and dog-bones. TDK Drivetrain Oil just like all our products is a safe, non-toxic, biodegradable lubricant. TDK Drivetrain Oil was made so it sticks onto the metal and doesn’t fling off the axles as the car accelerates to provide long lasting protection.