AMSOIL vs Royal Purple Motor Oil Comparison Table

AMSOIL Signature SeriesSAE 5W30 VS ROYAL PURPLE High Performace Motor Oil SAE 5W30 and Royal Purple HPS® SAE 5W30 Technical Properties ASTM (American Society for Testing and Materials) Tests – We extracted the information available from the respective manufacturers and put the information in the following table. The Head-to-Head side-by-side format makes it easy for you to decide your next steps in the synthetic motor oil that is right for you and your vehicle. Download your own PDF copy of AMSOIL INC Lubrication Fundamentals.

Technical Properties ASTM Tests	AMSOIL Signature Series SAE 5W30 (ASL)	ROYAL PURPLE High Performace Motor Oil SAE 5W30	Royal Purple HPS® SAE 5W30
Base Oil Group	100% Synthetic	Full Synthetic	Full Synthetic
Ability To Prevent LSPI	100% Protection Against LSPI	“Increased protection against LSPI” *Average of four test cycles, RP chemistry averaged	Unknown % of Protection Against LSPI
Total Base Number (TBN) ASTM D2896 (mg KOH/g) NOTE: The HIGHER THE NUMBER THE BETTER	12.5	8.6	10.11
Kinematic Viscosity @ 100°C, cSt (ASTM D445) (mm2/s)	10.3	10.5	11.03
Kinematic Viscosity @ 40°C, cSt (ASTM D445) (mm2/s)	59.7	62.4	56.25
Viscosity Index (ASTM D2270)	162	159	193
CCS Viscosity cP (Cold Crank Simulator) (ASTM D5293) (@-30°C/ -22°F) NOTE: The LOWER THE NUMBER THE BETTER FOR WINTER	3968 @-30°C/ -22°F	5,719 @-30°C/ -22°F	5,127 @-30°C/ -22°F
Pour Point °C (°F) (ASTM D97) NOTE: STAYS FLUID AT LISTED TEMPERATURE	-50°C (-58°F)	-45°C (-49°F)	-51°C (-60°F)
Flash Point °C (°F) (ASTM D92)	220°C (428°F)	238°C (460°F)	216°C (420°F)
Fire Point °C (°F) (ASTM D92)	244°C (471°F)	NOT LISTED by Royal Purple	NOT LISTED by Royal Purple
Noack Volatility, % weight loss (ASTM D5800) NOTE: Industry Limit Is 15%. The LOWER THE NUMBER THE BETTER	6.7%	NOT LISTED by Royal Purple	NOT LISTED by Royal Purple
High-Temperature/High-Shear Viscosity cP (ASTM D5481) NOTE: The HIGHER THE NUMBER THE BETTER	3.11	3.1	NOT LISTED by Royal Purple
Product Data Sheet / Technical Information Website Link	https://amsoilcontent.com/ams/lit/databulletins/g2880.pdf	https://www.royalpurple.com/product/high-performance-motor-oil/	https://www.royalpurple.com/product/hps-high-performance-street-motor-oil/
ACEA Standards	A5/B5, A1/B1	NOT LISTED by Royal Purple	ACEA E9-16
Applications and APPROVALS	API SP (Resource Conserving), SN PLUS, SN…; GM dexos1 Gen 2 (supersedes LL-A-025, 6094M and 4718M); ACEA A5/B5, A1/B1; Honda HTO-06; Ford WSS-M2C946-B1, WSS-M2C946-A, WSS-M2C929-A; Chrysler MS-6395; ILSAC GF-6A, GF-5, GF-4	Licensed and approved GM dexos1TM Gen 2, API SP Resource Conserving and ILSAC GF-6A Meets Chrysler FCA US MS-6395, Ford WSS-M2C961-A specifications	HPS is recommended for vehicles no longer under manufacturer warranty and for those seeking a higher level of performance and protection.
Service Life	Normal Service – Up to 25,000 miles (40,200 km), 700 hours of operation or one year, whichever comes first, in personal vehicles not operating under severe service. Severe Service – Up to 15,000 miles (24,140 km), 700 hours of operation, or one year, whichever comes first. Severe service conditions include commercial or fleet vehicles; excessive idling; or frequent towing, hauling, plowing, or driving in dusty conditions. • Modified engines (non-stock), racing vehicles, and vehicles using alternative fuels (E85, CNG, propane, etc.) are excluded from extended drain interval recommendations. • Change at the vehicle manufacturer’s recommended drain interval outside U.S. and Canada. • AMSOIL Oil Filters are designed for extended drain intervals. Do not exceed 12,000 miles (19,312 km) or one year with other brand filters unless longer intervals are recommended by the vehicle manufacturer. Always change the filter when changing oil. • Check oil regularly to maintain proper fill levels. AMSOIL Oil Filters stop smaller particles, flow more oil and last longer than regular filters. For best performance, use AMSOIL Oil Filters.	NOT LISTED by Royal Purple	NOT LISTED by Royal Purple

Why do some MOTOR OIL brands not publish some ASTM testing results?

If there is a test that says “Not Listed” it’s because the oil brand does not provide those test numbers to the consumer on their website.

If their test numbers are good, why don’t they share them with us?

We all know that when you’re proud of your test result whether it be a test in school or an ASTM Oil test the first thing you want to do is share your accomplishment with others.

Perhaps they know their test numbers are not as good as their competition, so they don’t publish it, because that would imply their product isn’t as good as the competition.

Would you trust a product from a company that holds back its test results?

After looking at many oil brands I was surprised by the lack of transparency with ASTM tests.

I would only deal with a brand that is honest and proud enough to show ALL their test results because it shows you that they have integrity, passion, and nothing absolutely to hide!

AMSOIL is a company that has a reputation for being honest, sincere and displays strong integrity to provide the absolute best for their customers. AMSOIL knows that their customers appreciate their longstanding devotion to making the world’s best synthetic motor oil and lubricants that blow the doors off the highest industry standards.

Today, virtually every other motor oil manufacturer has recognized the superiority of synthetic lubricants and followed the AMSOIL lead with introductions of synthetic motor oils of their own. Accept no substitutes.