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Here you go

I have 11 gas a diesel eng. and spend 40 hrs. a year changing oil / switched to Amsiol and cut that in half. Now I go fishing on my savings

I knew about the cost savings which is one reason I ran it. I also knew about the oil leak issue which is a reason I quit running it. Not because it leaked but because I couldn't readily replace the oil, always had to buy more and I hated the way they do things with the preferred customer thing. If they would make it easy to get then I would switch back.

Isx, one way that Amsoil saves money is in the longevity of the quality of the oil. The less you change it the less it costs. If you use it and have regular oil analysis done you just might be surprised as to how long you can run it until the contaminants get to the point of needing replacement. Also something to think about is the fact that Amsoil does such a good job of cleaning that IF you have a leak that is plugged with sludge from dino oil then it WILL leak with synthetic oil. Fleets that use Amsoil have shown a reduction in operating costs with synthetic oil and grease. Believe it or not, I have worked in the facility (building the piping) that Amsoil has for production and have seen what goes in to making the lubes and I am impressed. Oh, yes I am a dealer too, but more for my own use than anything else.

I was not looking to argue Bill. Just trying to figure out what stands out about it. The title is the doubters of amsoil though, hence my statement about what exactly stands out about it that people doubt.. If I did want to get right down to it though, I would like to see a generator with an exact load on it put through the tests with different types of oils along with dynoed and see what happens. Of course the biggest concern of all is if it is legit or not. I know amsoil has been here for 40 years but somebody somewhere will have doubts. I don't know why but they will, the fact that they do makes me have doubts. One of these days I hope to conduct my own tests, to be scrutinized by the public as well Now I do read a lot about people gaining some mpgs by changing every fluid on the truck to amsoil, enough people that I might actually believe it. I don't see how these people can track 0.1mpg though when a speedbump could throw the truck off by that much. But if I ever find a way to test it, I will surely test out amsoil and be another believer if it all does what it says. I guess nobody will ever be completely satisfied. Thanks for the documentation Bill, and thanks for being honest, that's really all I wanted to see. There's enough guys saying "buy amsoil because I said so" so it's a nice changeup.

I can't really compare it to anything else but Amsoil works for me. My dad has used it for 20+ years, and his parts usually last longer than average and he has hardly owned anything that hasn't been chipped (Chevy 5.7, 7.4), tuned (06 CTD), or turbo'd (6.2 Burb). He isn't a hard driver, just runs a little more power and does plenty of towing.

I'm going to throw something else out there.. We all know we need oil to lube, cool, clean, and I thought there was one more. In any case, what is to say that all oils on the market aren't plenty good for our cummins? My dad told me some months ago that back when he was in college they tested the engine drag using different oils and he said that anything with "lube" in it all had insignificant differences. I realize this isn't exactly a "wear over time" test, but it does say something. So if we say all oils lube the same, then as long as the viscosities are the same, they would all theoretically protect the same. I say that because I know thinner and thicker oil are needed under certain circumstances, which all oils on the market are capable of doing, unless you buy straight weight. I realize amsoil and every other oil company has tests that prove they are better, but whats to say these tests are actually beneficial to us? As in, if oil A wears more than oil B, are we gonna notice the difference a million miles down the road? Cajflynn has over a million now on dino oil pulling boats and stuff everyday and still runs great, so you can't throw out that obvious example. That brings me to the point that the only real factor in wear must be mainly contaminants. Crap that gets in the oil that is smashed between bearings and has it's way with them. That means the biggest contributor to oil wearing out engines goes right back to the oil filter. Dorkweed never changed his oil for 80k miles and it was supertech oil at that, all he changed was his oil filter and frantz oil filter every 5 or 10k miles. He is over 100k miles now, has no issues and still gets great mpg. The dual filter setup keeps it clean. Which brings me to point C. My theory is that the best way to keep the oil clean is use a centrifuge filter. I have never used one since they are expensive but I haven't read anything that said they don't clean better than anything else. Plus you just have to clean the crap out of them every now and then so there is no filter to change. Now going to the original paragraph on this post, the viscosity has to be the same or stuff isn't happy and like I said earlier in this thread, that is where amsoil has benefits. The cold weather operation is exceptional. But I see no other benefits that will hurt us in the long run for not using it. I mean if Cajflynn can go a million on dino, then what else is there to prove? Maybe it will easily go 2 million with amsoil, but I think there are other parts that wear out irregardless of engine oil so the engine would need to be rebuilt sooner or later, meaning the 2 million mile amsoil would have been a waste of time. I would actually like to see a nonbiased test of dino oil after 50k (drained from dorkweeds truck lol) and amsoil after 50k and see how much of a wear difference there is. Run both through a centrifuge to eliminate foreign crap. I just want to see if "oil wears out", or if it just gets dirty. As for Bill, I am not trying to talk down to amsoil, I don't favor any oil, I merely buy valvoline premium blue because it has a cummins on it, is blue, and is available everywhere. I would however, like to see something other than tests that amsoil performed when they are the competition.. Now if you can prove to me, after everything I just said, that amsoil is what I need to run because it will benefit me in the long run (and not just with cost, I know that), then I will switch back. I am not biased or anything so convincing me might be easy, though the examples I stated will be hard to match