Quote Originally Posted by dvldoc View Post
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
dvldoc, comparing again RP 15W-40 and Mobil 1 TDT with Motul Specific CRDI Diesel, are they on the same league? Almost on the same price range, 450 to 600...TIA.