See my confusion ... There's two different kinds of stories, for both these oils . I would think they're both better than Mobil 1, or most other big oil making manufacturers.... But seems like we're still in the dark, with not much light on this subject. I'm still running whatever it came with from the factory. Car has about 17,XXX miles. So, before I do a change in fluids, and "Think" what's best, I'd like to gather all FACTS ... And I'm sure a lot of others will also benefit from this and such threads... Keep the responses coming....

 

I'd love to know what you find out in the end... I could use something to help my 6-speed shift a little smoother...

 

Exactly.. I'm sure lot of other ppl will also benefit from this info. I appreciate all the Amsoil guys who wa nna give me free membership, but someone already did that for me. I got a package in the mail..on how to be an independent distributor, and how I can make money. I sincerely thank you all from the bottom of my heart to help me become a distributor. But I'm not ready for it yet. Maybe some old Amway memories... My entire goal at this point is to REALLY find out more facts about these 2 great oils out there. I've not heard of any better than these two. Now, its about about the winner and 1st runner up. My car has 17XXX miles, but its 6 yrs old also. So, due to the age of the car, I want to change all fluids, one by one...starting with ATF, Diff, then brake....then maybe power steering. Also wanna change Radiator fluid, summer coming up soon now. But I'm gonna start a fresh thread for that.. This is the match between Amsoil and Redline...

 

AMSOIL!

 

I really don't think you are going to find what you want unless you infer it from the data on the Bob's the Oil Guy website.

Here is a link to another AMSOIL Dealer website which is very dated, but somewhat pertinent to the discussion:
http://www.worldsbestoil.ca/redline-vs-amsoil.php

This test has been superceeded by a newer AMSOIL test which didn't include Redline so I don't have this particular test on my website. And, both AMSOIL and Redline have likely reformulated their oils several times since then, so it would be hard to draw real conclusions from this, but you could make an assumption that they haven't changed that much.

When I became a dealer I asked why AMSOIL didn't have Redline on test info such as this one (on my website):
Comparative Oil Test

I was told, and can't verify the truth of the statement, that AMSOIL didn't really consider Redline a competitor and thus didn't spend the extra money to pay the independent lab to run all the tests on Redline. In most markets that AMSOIL is in, Redline is just as much a niche supplier as AMSOIL so they don't really draw many customers from AMSOIL. May not be true in the Vette market where I am...

AMSOIL makes big money in the diesel, 2 and 4 cycle off road market (motorcycles and snowmobiles, ATV, Boats, etc) and the commerical market. Redline is predominantly automotive motorsports and has a much bigger footprint in the circles I run in than does AMSOIL.

My opinion is that they are both excellent American products.

Finally, as a reminder for those following this, there are only two AMSOIL forum vendors, me and MrPickles who is assisting me as I don't have a lot of free time right now. All sales via our dealerships benefit our respective racing efforts and this forum. Thanks for all who support us and the forum.

P.S. I know you jest about the AMSOIL vs AMWAY comparison and I've heard that more times than I care to remember. But, FYI, the company was founded by a retired AF LtCol who flew fighters for the Air Force. His name is A.J. "Al" Amatuzio. He retired from the Air Force and started his own company making a product that he had used in his jet engines: synthetic lubricants. I believe that AMSOIL is a play on his last name, as in Am's Oil or AMSOIL.

 

What I find odd is that Redline has different ATF offerings for each of the mineral ATFs on the market and Amsoil has only one ATF to cover all the different ATFs on the market. Since each ATF has different properties (friction is the main difference, I think) such that running Type F instead of Dex III in your tranny is sure to do damage, how can Amsoil have all friction coefficients in one fluid???

This is a perfect example of how additional information can make someone question their earlier beliefs. In my earlier post I said Amsoil all the way, but now I wonder Still think it's best for motor oil, but I guess I'm still skeptical on the transmission fluid. I have reason to be skeptical based on my dismal experience with their air filters (on all 3 of my vehicles). Knowledge is power, but only when it's complete and can be used to support a conclusion. I think many of the lubrication manufacturers purposely provide enough information to make us unsure and then use other people's experiences to 'tout' their products. I mean, why don't they show their chemical makeups for comparison?

 

TopCat,
AMSOIL does make several transmission fluid choices including one for Type F applications, but the ATF does meet most passenger car applications inlcuding DEXRON III for the C5/Z06.
AMSOIL ATF
AMSOIL Synthetic Powershift Transmission Fluid
AMSOIL Supershift Racing Transmission Fluid
AMSOIL Torque-Drive Synthetic Automatic Transmission Fluid
AMSOIL Synthetic Tractor Transmission Fluid

I wouldn't assume that because the ATF meets a lot of specifications that it doesn't excel at any. I have had very good experience with the ATF and I use it under extreme conditions. At my last race, my left axle seal gave out and I lost at least a quart of diff fluid during the 26 lap race. With that lack of cooling, the diff got extremely hot and heated the tranny. I got a tranny high temp warning at 277 on lap 20. As my tranny has a cooler and the temp is sensed on cooler return, the tranny must've been much hotter and who knows how hot the diff was. But they both held up and I didn't note any problems with either (other than the trail of smoke I was leaving) through the end of the race (which I won).

And, I have learned enough about oil companies in the last year and a half to realize none of them release info on what is in their products, probably so it is harder for other companies to copy them. But, there is enough new and used oil analysis to tell the basic makeup, and after reviewing tons of the reports on Bobs site, I still believe that both AMSOIL and Redline are both excellent lubricants.

As a note, I did switch from Redline D4-ATF to the AMSOIL ATF. Both are good, but I can get the AMSOIL for much less than the Redline and given how much I use it made sense to me to switch.

Their oil filters are excellent, but in general, I have stayed away from the air filters as well (except for the one for the 6.0L PowerStoke and 6.0L H2 Hummer engines which is very good, I have one in my F350). They are hard to use and clean. I don't think I have ever recommended the air filters on this forum.

 

When I worked for AAMCO Transmissions, we didn't even have any Type F fluid in the place. We put DEXRON in everything. The Ford Type F fluid had a friction additive that made for a more positive shift with less clutch and band slippage.
Even though we used Ford materials, we always filled the trannys with DEXRON fluid. It let the clutches and bands slide a little more, which resulted in some extra wear, but it made the trannys shift much more smoothly. This made the normal customer happy.
So it was one lubricant (fluid) for all trannys, but NEVER Type F in the power steering unit. Those always got DEXRON at the time.
Things have changed over the years. Now, it seems, the manufacturers can find a compromise that will work in everything. I still stick with the recommendations of the manufacturer of the equipment. There is always a trade-off somewhere when you use a one-size-fits-all solution.
Before someone jumps down my throat, I am not knocking Amsoil or Redline, but I'm so old that I still remember when Amsoil was replacing engines because their Teflon additive was plugging up oil filters. They've come a long way since then and I have used Amsoil myself. The local Chevy dealer sells Royal Purple, so go figure. The local ricer owners swear by it.

 

I have never had a failure using factory recommended oil for the diff. with the additive package for limited slip. However I have worn out a gear set (ring gear and pinion) using Synthetic diff. gear oil. I won't mention the name brand here. If you would like the specifics email me.

I know many synthetics in gear boxes work but I had to buy my own gear set. I didn't have any company offer to make repairs so I always use the factory oil and additive in the diff. Now the engine is a different matter. It does not see the shear forces of the ring and pinion and synthetic in the engine is great stuff.

99 Nassau blue,, ala,, natural.

 

Amsoil has been shown to give you up to 10 more rwhp than Redline.

J/K, they are both the same.

 

Redline's reputation among the racing crowd is second to none. Amsoil is more of a extended drain oil. I would use Redline. bobsistheoilguy's two top experts recommend Redline over the other brands. Amsoil doesn't compare specifications to Redline because Redline is a better oil. The testing Amsoil does, like the 4ball wear test doesn't apply to oil in an engine. It's a test for grease. Amsoil also seems to thicken in extended drains. It's a very good oil, but Redline is more preferable for a corvette in my opinion. Mostly ester based.

 

I also have heard it said, not to use Redline in an A4. Before hearing it, I had it put in my new lvl 4 A4, and ended up replacing that tranny soon afterwards.
Don't know if Redline was a factor in the demise of the trasmission or not...so for now, I only use GM recommended fluid in the tranny. However, I do use Redline in my aftermarket differential, and may switch to Redline in the engine as well.

 

Why don't you do the best method possible and test them both. Shoot, as stated I have Amsoil in one Vette and Redline in another. And also run Royal Purple in my wifes Pathfinder. They all work great. I do know that the LS tick isn't as evident asit used to be. And as others have said, Amsoil and Redline work great! Shoot, I'm about to try another synthetic called NEO. According to their website they were in 80% of the Lemans cars. When it comes to synthetics I think they are all pretty damn good. Most people on here have told you how good Amsoil is and yet you keep asking for more. Since you don't want to take their advice simply put it in and try it. If you don't like it then change it out with something else. It's only about $30 if you do it yourself.

 

Its not about $30. And everyone seems to have a different opinion, which is a great learning process for some of us. My question was not for just engine oil...... (If you'd read the original, and some other posts).... I was trying to do research for A4 Tranny, and Diffrential oil. I know the engine oil is a much easier choice to deal with, cuz its easier to change...which we do anyways every few thousand miles... If you have any info on the A4 (AT Tranny) and Diff oil.... Plz continue to share... Thanks...

 

I also had some doubts, well not really doubts but still leary when someone that sells that product tells you its good, heres my story that i posted a month or so ago:

cant find it so heres my story and am no way friends with or have anything to do with selling amsoil....

I had changed my diff and tranny fluid (M6) to royal purple and i didnt notice any of the "wow my car shifts so smooth now" so a month or so ago i went to the store to buy some redline and they didnt have it in stock but did have amsoil tranny and diff fluids...so i bought it and drained the purple stuff and put the amsoil in....well all i can say is "my tranny shifts like butter now" it was a notacible difference and i think some day ill try out the redline but im very happy with the amsoil tranny and diff. fluids..

crap read u have an auto (duh) oh well i guess its not too big a help but maybe to those with manuals...and again i havnt tried redline so cant say anything good or bad about it...

Jack

 

Any lubrication engineer will tell you that the 4-ball wear test is meaningless in comparing how good a motor oil can protect an engine. If you don't believe this, call Dave at Redline, Mobil, Shell, Castrol or even go to www.bobistheoilguy.com and have a read. It's pure marketing bull****. Coca Cola would outperform Amsoil in a 4ball wear scar test. Would you put that in your engine?

 

Red Line is not even comparable to Amsoil
Stay with the First & best since 1972 .... Amsoil.