Question 1

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?

Accepted Answer

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.

Question 2

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

Accepted Answer

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.

Question 3

Is this listing for 1 quart or 6 quarts?

Accepted Answer

this is for 1 quart only

Question 4

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

Accepted Answer

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.

ASIN	B005SEK9IQ
Automotive Fit Type	Vehicle Specific Fit
Brand Name	Royal Purple
Compatible with Vehicle Type	auto;truck;van
Container Type	Pail
Customer Reviews	4.9 4.9 out of 5 stars (2,270)
Global Trade Identification Number	00641330510205
Item Weight	3.63 kg
Liquid Volume	4.73 Liters
Manufacturer	Royal Purple
Manufacturer Part Number	641330510205
Model Number	ROY51020
Size	5 Quart (160 Ounces)
UPC	641330510205
Unit Count	4731.76 Milliliters
Viscosity Level	Low

Royal Purple 51020 API-Licensed SAE 0W-20 Synthetic Motor Oil - 5qt

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