priced well, cheaper than other parts stores. been using royal purple diesel oil for a while on both my diesel trucks 6.7L Cummins, exhaust smell doesn't stink like most diesel oils out on the market.

Good stuff and good price with fast delivery.

best oil for my diesel varriew 4lbs more oil pressure than amsoil.

Fantastic oil for my Cummins diesel.

I have used this product for several years now and am very pleased with it's performance. I had been using another high quality synthetic motor oil for a long time and while it worked well Royal Purple exceeds it. With Royal Purple the diesel engine in my 2001 Ford runs quieter and usage is practically zero. What got me to first try Royal Purple was the price from Walmart but I'm sold on it now no matter the price. I'm just now switching over to their Max Tane injector cleaner.

Great product at a Very Good PRICE.

This is by far the best oil. And the walmart price is unbeatable. Thumbs up

Been using this product for years

Great Oil. I tried a different viscosity in my Subarus and was impressed with the product - so I decided to buy this for my cummins. It's a winner! Very happy with the performance and the amoothness of the engine on Royal Purple. Yes - you pay a bit more. But if you are changing your own oil, you obviously care more about you car than most people. Spend a couple extra bucks and buy a premium oil and see for yourself. Smooth is efficient and that smoothness means there is less internal "conflict" in your engine. Less wear and tear. Cold starts are greatly improved. So the oil stays there for awhile after shut down. I am a fan of this oil in my truck.

Ordered 4 gallons. Lady only brought me 3 golons out there. He said they didn't have any more. I come back inside right after words. They got 3 more gallons in here. Lazy, poor customer service, pay attention to detail.I would say, hopefully I get my money back