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Truly which synthetic brand of motor oil is the best?

After much research I started using Amsoil Motor Oil approximately 12 years ago. Still for example in many publications like the Turbo Diesel Register and rv.net they report great reviews of Amsoil products. I drive about 500 miles a week to work and back round trip. In my 87 Toyota I have been using Amsoil 2000series oil and in my 99 Dodge Cummins pickup I been using Amsoil 3000 heavy duty turbo diesel oil. In both vehicles I conducted oil analysis about every 15,000 miles on the truck and every 25,000 miles on the car. The car has 350,000 miles on it and for example, after 35,000 miles on the same oil; the analysis says the oil is still in good condition and the truck after have 44,000 mile on the same oil; each time the oil analysis comes back saying the oil is in good condition. I do have the Amsoil bypass filtration system on both vehicles.

I am not trying to start a war. I am just trying to become better educated in the field of liberation as a consumer. What truly is the best brand of synthetic motor oil? What are the consumers and experts thoughts?

Chuck
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