
Originally Posted by
dvldoc
Both have about 1200ppm zinc so the level of protection will be about the same, it's going to come down to price.
Current API rating
ROYAL PURPLE 0W-40 SM/CF August 8, 2010
ROYAL PURPLE 10W-30 CH-4,CI-4/SL August 8, 2010
ROYAL PURPLE 10W-30 SL* August 8, 2010
ROYAL PURPLE 10W-40 CH-4,CI-4/SL August 8, 2010
ROYAL PURPLE 15W-40 CH-4,CI-4,CJ-4/SM** August 8, 2010
ROYAL PURPLE 15W-40 CH-4,CI-4/SL** August 8, 2010
ROYAL PURPLE 20W-50 CF/SJ August 8, 2010
ROYAL PURPLE 30 CF/SJ August 8, 2010
ROYAL PURPLE 40 CF/SJ August 8, 2010
ROYAL PURPLE 50 CF/SJ August 8, 2010
ROYAL PURPLE 5W-20 SL* August 8, 2010
ROYAL PURPLE 5W-30 SL* August 8, 2010
ROYAL PURPLE 5W-40 SM/CF August 8, 2010
Mobil TDT is CJ-4, CI-4, CI-4 Plus, SM, SL