Buy Royal Purple 04154 API-Licensed SAE 15W-40 High Performance

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List Price: $38.99
Sale Price: $35.02
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I bought this 5 gallon pail thinking I would get two oil changes for my diesel truck which needs 10 quarts per change. I carefully measured the quarts for the first oil change, using only 10 quarts. That should have left 10 quarts for the second change. When I did the next change, I came up 3/4 of a quart short. I called the company and was told they fill the pails by weight, not by volume or liquid measurement. I informed them that I had purchased 5 gallons, regardless of how they fill the pails and that i was now short for a complete oil change. The customer service person apologized and immediately sent me a couple quarts, free of charge. I was advised that they would be looking into the filling process to ensure that 5 gallons was in fact 5 gallons.

It is a great synthetic oil and I am very happy with it. It deserves 5 stars and I would have given them except for the short change....

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Changed oil all kinds all my life. This is the first one I ever noticed a difference in increased horsepower and lower engine noise. The car just purred like a kitten. Seriously...it made a difference. Gas mileage improved as well... amazing...

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Used this oil in my Ford 7.3 with a slide in camper on the back. 5,000 miles driven. No loss of oil. Vehicle started and ran well. Toss up between Amsoil and Royal Purple. Make your own choice but Royal Purple does not make an oil filter for the 7.3. Extended drain intervals are good but you have to change your oil filter to extend. K&N were recommended by Royal Purple. Amsoil makes a filter so there is no inconvenience if you are traveling. All in all, it seemed to work well in my truck.

Honest reviews on Royal Purple 04154 API-Licensed SAE 15W-40 High Performance

For the discount price I bought it at ($72.00) it was cheaper than buying 5 gallon containers, but not as convenient to fill my 12 quart diesel system. Seems to help truck run cooler and better performance than normal oil.

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My 6-cylinder car has over 167,000 miles on it and the motor still purrs like a... well, you know. I recently added Royal Purple 15W-40 for the first time. After driving perhaps 1,500 miles with the Royal Purple, everything seems fine. The motor still purrs. Besides, how the heck can a regular consumer like me rate a motor oil unless something goes horribly wrong? If all goes well, you simply say that it's good stuff. And how does a regular consumer justify paying the price of this stuff? Perhaps in a year or so, when the Royal Purple has 12-15K miles on it, I wll give it another review. For now, I'll just say that...having it in my engine gives me a little more piece of mind. Just a little.