Reviews of Royal Purple 01250 API-Licensed SAE 20W-50 High Performance

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I blew an engine running Mobil 1 and Mobil refused to be of any help. I run Royal Purple in my truck, car and 2 Harleys and have never had a problem. When I pulled the3 cylinders on my '03 Fatboy with 52,000 miles, they still had hone hash marks from the d=factory. Virtually no wear!!

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Great oil, not available at this viscosity at advance auto parts or auto zone. My car is 1990 Mercedes 560SEL that requires 20w50 my gas milage got better and the car runs much smoother. In hot conditions the oil pressure gauge doesn't go below 1.5 bar.

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After using Royal Purple for years, i'll never use anything else. it reduces my engine temp. it increases my MPG's. it reduces many sounds of running. I get many more miles between oil changes with a lot of oil life left over.

Honest reviews on Royal Purple 01250 API-Licensed SAE 20W-50 High Performance

This stuff's been working great in my car. Amazon has great prices like always!

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Vehicle: '88 Mercedes 300TE, M103 Gas engine, 178k mi.

Engine condition: Maintained, proper tune & tolerances, Meets Cal emissions with original 25 YEAR OLD cats.

Oil this replaces: Mobil 1 15W-50 @ 3,500 miles, 6.3qts.

Environment: Southern California, practical annual service conditions of 0-9500ft, 28-102F, and 5-80% humidity, within 75 miles.

The Mobil 1 changed out of this car proved unsuitable for the application. It caused the valve train to be noisy generally, and half the time when starting cold, there would be lifter noise for 4-5 seconds until they pumped up. The motor had not had this issue with the conventional Castrol 20W50 used prior to Mobil 1.

I purchased this Royal purple for 3 reasons:

Synthetic available in 20W-50 grade, good price, and Amazon free shipping. I observed a difference after the Mobil 1 Synthetic was replaced by Royal Purple. At first warm up the valve train became quiet, and the lifters thereafter have been quiet on cold starts.

This is one of only a half dozen times in 40+ years that I have observed a lubricant's brand superiority for a particular application. Of those instances, half of the stand-out products were created by Texas-based lube-specialty houses like Royal Purple. They are/were:

Heavy specialty greases from Lubrication Engineers (LE grease).

Apps: Cranes, heavy equipment, severe duty marine & environmental.

PTFE light synthetic & flowable greases from the original SuperLube.

Apps: Light & precision mechanisms, sailboat hardware, and FDA food processing machinery.

And now this API motor oil from Royal Purple.

Apps: Overhead cam automotive engines, particularly those with internal chain-driven components.

Other Hall-Of-Fame lubricants:

The very first 20W-50 multi-grade motor oil created by Castrol in the UK.

Apps: Hard service automotive, race engines facing very different track climates and altitudes.

Early synthetic 2-stroke oil from Bel-Ray in New Jersey.

Apps: Motocross bikes, snowmobiles, foul-prone slow-operating outboard motors.

And the grandaddy, refined castor bean oils for 2 & 4 strokes by Blendzall in Ohio.

Apps: Drag racing, racing outboards, Nitro & alcohol burners, piston aircraft racing.