Prices vary dependent upon whether you are a regular customer or a "preferred" customer. I think for their regular synthetic 5w-20, it was about $6.50 under regular customer prices. But if you spend $20 to be a 1 year preferred customer, you get 15%-25% off their items for that year of buying their stuff. The 0w-20 is quite a bit more, about $2.50 more a quart than their 5w-20.

 

Old Cheeech did his homework on this one. It's well documented now that Amsoil gets thicker and thicker with repeated heating and coolings. It's how they "cheat" to get such long life out of it.
I'm not saying that Amsoil is not a good product, but I'd hesitate to use it in an MDS engine for sure, because the proper viscosity and flow of the oil is so important for proper engine performance. On a pre-MDS Hemi, such as yours, I'd feel a little better about it...

 

i'd use it without hesitation as long as you still change oil at 6k, 8k tops. i had it in the truck, quieted down the ticking, bumped my mpg a little, ran smooth no problems...till 8k, then i felt it start bogging down.

 

hey hammer,where is this documentation that Amsoil gets thicker? i had it in my car for 20,000 miles of pizza delivery in a turbo car and had it tested by a lab (not at Amsoil) and they said keep using it , it is almost like new.

 

Snake oil!!
Use 5W20 and change it at the recommended intervals in your owners manual and even Dino oil will work just fine.
If an oil is doing it's job with proper detergents, it will suspend the dirt that doesn't get caught by the filter and I sure wouldn't leave it floating around in my engine for 20K plus miles.
I have always changed my oil every 3K with dino oil on all of my vehicles and have never had any oil related problems with any of them. My 5.0 has over 164K on it and it is very clean inside. I opened it up for the first time last fall to install a larger camshaft and there is no build-up of any kind.

Just my tried and true opinion.
I would use Royal Purple if I was to use a synthetic oil. Not something that can not be bought at a local autoparts store.


Oh, I'm a qt low, I better mail order a qt of oil. WTF???

 

It is pretty well documented now, here is the first one that hit on a Google search:
http://neptune.spacebears.com/cars/stories/amsoil.html

 

changing oil every 3k for me would be every month and a half. pretty much the only reason i use synthetic.

but i agree, if you can change it every 3k, just use a good dino oil. dollar for dollar you won't gain anything by going to a synthetic. hell, i've gone 5k (most highway) on my old car with dino oil. had 160k, would have gone 300 easy.

 

I get about 2 months or so out of 3K. The manual actually says 6K for easy driving and 80% of mine is highway miles, but I'm old school and stick with the 3K thing.
I do my Grand Caravan on time because I bought it in Feb 08 and it just has 5200 miles on it

 

i don't know, i don't see all his documentation, but i know we have hundreds of independant labs up here every winter. if my(our) viscosity went up that much none of our cars would start in -30 to -40 weather with 40 or 50 weight oil.

 

People who want to justify why they don't use Amsoil are quick to drag out this study. It's definitely an interesting study. Yes, the Amsoil viscosity increased from a 5W-30 to about a 15W-40 over the course of 14,000 miles and 13 months. The Mobil 1 viscosity also changes over time; increasing for several thousand miles and then oddly decreasing during its 11-month test. If you read the details, you'll see that they had to add 6.5 quarts of top-off oil in the Mobil 1 study. The Z28 running Amsoil added only 3.5 quarts. It's not exactly fair to compare the viscosity changes for this reason. On the Mobil 1 page of the study they actually point out the effects of the top-off oil. What is really impressive about the Amsoil study was the small amount of wear metals in the oil over time compared to the Mobil 1.

I use Amsoil in all my vehicles and small engines. I get a Blackstone Labs UOA every time I change the oil in my Cummins, and the viscosity has never increased. For my Chrysler 300M I don't get a UOA after every change, but when I do test it I find the oil viscosity changes are negligible after 7,000-8,000 miles. How many of you Hemi guys are stretching oil changes past 12,000 miles?