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Satisfied Customers

Amsoil Testimonials

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Mark Austin put AMSOIL 15W-40 Heavy Duty Diesel and Marine Oil in his 2002 Ford 250 Super Duty Diesel pickup with a Turbo-Charged Power Stroke V-8 engine. “I call it the monster truck,”Austin said. And he uses that truck hard. He hauls a 32-foot travel trailer, his dirt bikes and his family of four with the truck. “That truck is a real hoss,” he said.

Because it’s a diesel engine, Austin said, it’s never going to run quietly, but when he put in the AMSOIL “it immediately got quieter,” he said.

The truck gained power, as well. “It has better acceleration off the line than it had before, and better acceleration across its full range. You can really feel it in the seat of your pants,” Austin said. “And the whistle of the turbo charger? This oil shut that turbo charger up. It’s almost inaudible.”

He has a personal theory that the turbo charger is spinning so much more freely with the AMSOIL motor oil that his acceleration has improved. However, Austin admits it is simply his experience with the AMSOIL motor oils, and not the result of any scientific study.

He has, however, measured the difference in gas mileage with the huge diesel engine. Before using AMSOIL motor oil, Austin got 11 miles per gallon doing in-town driving. After he installed AMSOIL, he got 13.8 mpg. “That’s like 25 percent,” he said. “That’s a huge improvement.

“I have to say I am thoroughly impressed,” Austin said. “Of course, on a dirt bike, the engine is exposed so you can hear everything, and the valve train went silent.” The bike also has more power, less vibration and revs more freely, he said. “Shifting also has improved,” Austin said. “With the Mobil 1, the shifter got mushy when the engine was very hot. With the AMSOIL, the shifter remained crisp.”

“I am a big fan,”Austin said. “I used to think you AMSOIL guys were just a bunch of zealots, and now I am one.”

AMSOIL FOR ALL OF HIS VEHICLESMark Austin poses with his vehicles outside his home in Richardson,Texas. Austin says he’s not only an AMSOIL customer for life, he’s an AMSOIL “zealot.”

Mark Austin , Richardson, TX

"I thought I’d drop you a note since I’m pretty excited. I switched all three of my trucks to AMSOIL products over the last few days: engine oil, transmission, front and rear differentials.

The news is about my tournament truck. I have a 2011 Ford F250 with the new diesel engine. Before I made the lubricant switch, I filled the truck with diesel and headed to Duluth (Minn.) to get some work done.

I was bucking a head wind and got 17.8 miles per gallon, which is pretty normal going against a 30 mph wind. I got the lubricants switched and some other work done on the truck, so it stayed overnight. The next day I came back with my wife’s truck to get her lubricants switched. That day we drove both vehicles back home, and this is where it got interesting.

The wind was dead calm and I wanted to see what happened to the gas mileage, so I drove the speed limit and used the speed control on the truck most of the way. I’ve made this trip from Duluth to my house many times where I tried to get the best gas mileage, probably no less than six times when I was watching closely.

The best mileage that I ever got on the stretch between Duluth and Ashland (Wis.) was 20.4 mpg, and since the stretch between Ashland and my house is really hilly, the mileage goes down and the best overall performance when I reach my house has been 19.4 mpg.

Using the same diesel fill as when I took the truck to Duluth, I got 22.4 mpg from Duluth to Ashland and 21.3 when I got home! That’s almost two miles per gallon better by just switching to the AMSOIL lubricants! I would have never believed that it would have made such a difference, especially since Ford uses synthetics in the new diesels already. All I can say is WOW!"

Gary Parson
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Highly Recommended Products

  • Put in 1 ounce for every 5 gallons of fuel during each and every tank.

    Diesel Injector Cleaner
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  • Virtually ELIMINATE oil changes! Never drain the oil. Change filter every 60k mi.!

    AMSOIL single & dual Bypass Oil Filters
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  • First time using AMSOIL? Clean out sludge and varnish before installing AMSOIL oil.

    AMSOIL Engine Flush
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