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Now we just have to wait....

 

I hesitate to get into a discussion of whose has the better oil. Both Amsoil and Mobil 1 are excellent products and will do more than an excellent job. I will say that there is no contest between a mineral oil and a synthetic. I just tend to like an oil that several High Performance engine manufacters Chose after extensive testing to put in their engines as factory fill. Those manufactuers include Corvette, Dodge Viper, Porsche, All Aston Martins, Ford's new GT, Mecedes Benz AMG among others. The product they chose was Mobil !.

 

Anyone use Royal Purple?

 

I use Mobil 1 MX4T in my Predator.

 

There is a hidden agenda behind the manufactures using Mobil instead of AMSOIL or any other brand. It all boils down to $$$.

Chances are there is a contract somewhere that has Mobil packaging the lubricants for Ford, Porsche, etc. and so those car manufactures also advise the public to use Mobil.

I know in my F-150 owners manual it specifies to run BP gasoline! lol

All I know is what has worked for me.
Ex: I have a 2004 F-150 w/ 5.4 V-8 .. On a recent trip I averaged 17.8 mpg. When I returned home I changed the oil with AMSOIL 0W-30 Severe Duty Oil. It has a change life of 1 year or 75,000 miles which ever comes first. I change the filter at 4000 miles and top off the oil. Two weeks ago I had to go on the same trip and I averaged 20.1 mpg. That is setting the cruise on 75 mph.

Ex2: I drag race a 1969 Pontiac Tempest w/ 455 .. est. 500 hp. I was running 11.9 @ 112 mph. I used to run Straight 40 weight as per instructions from a old Pontiac Racer, I changed it to AMSOIL full synthetic 5W-20, first run off the trailer it ran 11.8 @ 115 and now it averages in that range and I haven't changed the oil in 2 years! I get the oil anylized and it always comes back ok. Totally opposite what we have all been taught! Of course this can't be done with mineral based oils. And that has to be good for the enviroment too.

 

Today's oil change for the 600 is my first Amsoil experience, I only started it and drove it enough to put it back in the garage so I can't say I noticed any differences. I'll have to wait until Sunday because we are supposed to get washed out tomorrow. I mainly went with the Amsoil because I refuse to give the local dealer any business and the Amsoil is much cheaper even with the shipping. I'm hoping it is a good investment, only took a couple days to get here and I plan to switch the cars and yard equipment over also.

 

That was my reason for going to AMSOIL. Saved a bundle buying it myself with filters rather than getting the kit from Polaris Dealer. I have since become a preferred customer with AMSOIL so I can buy it for myself cheaper than the local parts store can sell it. I've put it in all my vehicles, family and friends. Not very often you find something that works like they say it will. [img]i/expressions/face-icon-small-smile.gif[/img]

 

I know Amsoil is a good oil, but in your 2 examples you are going to a lighter oil which would explain the increased power and MPG increase. I don't believe that changing oil with the same weight it going to give you a 2.5 mpg increase. There are many other factors involved here besides the oil. And again don't give me the standard Amsoil speech. I know it is good oil and I have used it, but it is the people that claim huge horsepower and MPG gains that make people sick of hearing about Amsoil.

 

my brother works with a guy who drives semi rigs for a living. this guy has a semi with a detroit diesel V16 750 horsepower. he runs Amsoil in it, he left the oil in the engine for 100,000 miles and changed the oil filter every 25,000. at 100,000 he sent a sample of it back to amsoil for testing and they said it was still good and keep useing it.

so theres a testement to strength

 

tmorris1, Tiger81269 is just conveying his personal experience with both FACT and OPINION. If he is satisfied with a product then good for him. Regardless of the scientific fact behind his experience, I think it is great that he feels he has got his money's worth. These forums are an excellent resource for information, however, very little of the content is backed by extensive indisputable data. No one here is trying to sell anything. We are here to help each other and share information in a positive manner. Peace.