I have seen Royal Purple oil being used in race engines for years....what makes Royal Purple Full Synthetic better than say.. Mobil1 Full Synthetic?

Royal One is considered one of the better synthetic oils. Notice it does not say 100% synthetic. Only if they say 100% are they completely free of any petroleum based oil. Also note sticker says approved by Petroleum standards. Mobil 1 says this too. A 100% synthetic oil requires no additives. In Europe, fully synthetic = 100% synthetic. In the United States it doesn't.

Is this oil ok to use in my supercharged fr-s using e85 fuel? i change my oil every 5k miles

Looks like you keep up with maintenance, so yes, I think it would suit your needs. The first oil change with Royal Purple is a time in which the oil acclimates to its engine environment. You can still get 5000 miles out of it, but with the second oil change you will see a subtle change with oil life extending beyond the 5000 to 6000 or more. In my case, I am getting 10000 miles between oil changes, and the oil still has no burned smell to it. I do recommend using a good oil filter as well, like Wix, or something that can take the temperature ranges. If your engine is using oil, then I'd be cautious in making the switch, otherwise I have no regrets. With the last rebuild on my 1988 Jeep Wrangler I started it off with Royal Purple and haven't looked back. Engine runs smoother and I get the extended oil mileage.

Does this work for the 2013 toyota prius v? i am looking for this with 75,000+ miles with royal purple hmx high mileage synthetic 0w-20 ilsac gf-5 mul

I use it in my 2017 prius 2. It works great. Comes out looking damn near new after 10k miles. When i need to switch to high mileage oil, i will use HMX.

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🛢️ Drive smarter, not harder — Royal Purple powers your engine’s peak performance.

SEAMLESS UPGRADE - Compatible with mineral and synthetic oils—no special procedures needed to switch.
CERTIFIED PERFORMANCE - Meets API SN, ILSAC GF-5, and Dexos1 standards for trusted, high-performance motor oil.
FUEL EFFICIENCY BOOSTER - Optimized 0W-20 viscosity reduces friction, helping you save on every mile.
EMISSION SYSTEM GUARDIAN - Protects your catalytic converter, keeping your ride eco-friendly and compliant.
ENGINE ARMOR IN A BOTTLE - Advanced synthetic formula shields your engine from wear and corrosion, extending its life.

Royal Purple ROY51020 is a premium 0W-20 synthetic motor oil engineered to enhance engine performance and longevity. It offers superior wear protection, improves fuel efficiency, and safeguards catalytic emission systems. Fully compatible with mineral and synthetic oils, it meets rigorous API SN, ILSAC GF-5, and Dexos1 certifications, making it the go-to choice for professionals who demand reliability and efficiency.

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Manufacturer	Royal Purple
Brand	Royal Purple
Model	51020
Product Dimensions	20.96 x 12.7 x 21.59 cm; 3.63 kg
Item model number	ROY51020
Manufacturer part number	641330510205
OEM Part Number	51020
Item Weight	3.63 kg
Viscosity	0W-20

Royal Purple ROY51020 API-Licensed SAE 0W-20 High Performance Synthetic Motor Oil - 5 qt.

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