25 years ago I used Amsoil ATF and found it to be a very good fluid. Used it for several years and never had any problems at all. When M1 came out with their fluid( something like 18 years ago) I satrted using it in transmissions and PS pumps, and like it very well. As with Amsoil, I have never had a failure with M1 fluid in transmissions or PS pumps.
Mobil 1 vs. Amsoil ATF
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Can anyone explain the large difference in the Brookfield Viscosity @ -40 between Mobil 1 and Amsoil? [/quote]
Yes, the lower number is better, but Mobil and Amsoil use different methods (Amsoil's method is being the correct one)Mobil's Brookfield Viscosity method is ASTM D 5293, which is commonly used for engine oils and gives you lower number and Amsoil's is ASTM D-2983, which will give you higher number. Brookfield viscosity is more important these days than pour point because oil engineers found a way to make oil move at minus 45C, but the oil is still to thick to flow well.
AS for Viscosity index, these days the index which is too high is actually bad because it means the oil is full of Improvers which will shear relatively fast. Oils with high viscosity index usually will have high Specific Gravity, because they are full of long polymer molecules (Improvers). Specific Gravity below 0.85 might indicate the absence of improvers and indicate the oil is true synthetic oil, and not stuffed with improvers to make it behave like synthetic but for a short time before the improvers shear.
Can anyone explain the large difference in the Brookfield Viscosity @ -40 between Mobil 1 and Amsoil? [/quote]
Yes, the lower number is better, but Mobil and Amsoil use different methods (Amsoil's method is being the correct one)Mobil's Brookfield Viscosity method is ASTM D 5293, which is commonly used for engine oils and gives you lower number and Amsoil's is ASTM D-2983, which will give you higher number. Brookfield viscosity is more important these days than pour point because oil engineers found a way to make oil move at minus 45C, but the oil is still to thick to flow well.
AS for Viscosity index, these days the index which is too high is actually bad because it means the oil is full of Improvers which will shear relatively fast. Oils with high viscosity index usually will have high Specific Gravity, because they are full of long polymer molecules (Improvers). Specific Gravity below 0.85 might indicate the absence of improvers and indicate the oil is true synthetic oil, and not stuffed with improvers to make it behave like synthetic but for a short time before the improvers shear.
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i actually learned something today. thanks for real hard core discussion.
I have personally used both. I may have been the one to observe a slight MPG drop using M1 in a honda auto (with LG black). It never went back in the honda after its next change, but found use in my jeep T-case where it was stout, very quiet and seemed to hold up well. It always drained out as nicely as it poured in.
The amsoil has had zero negative effects on the 3 hondas (mom's, a totaled ody and wife's current MDX). Since I can buy amsoil OTC locally, everything but the jeep (atf+4 with lifetime warranty) gets it. If it were not for the warranty, the jeep would get amsoil too.
M
I have personally used both. I may have been the one to observe a slight MPG drop using M1 in a honda auto (with LG black). It never went back in the honda after its next change, but found use in my jeep T-case where it was stout, very quiet and seemed to hold up well. It always drained out as nicely as it poured in.
The amsoil has had zero negative effects on the 3 hondas (mom's, a totaled ody and wife's current MDX). Since I can buy amsoil OTC locally, everything but the jeep (atf+4 with lifetime warranty) gets it. If it were not for the warranty, the jeep would get amsoil too.
M
Originally Posted By: meep
i actually learned something today. thanks for real hard core discussion.
I have personally used both. I may have been the one to observe a slight MPG drop using M1 in a honda auto (with LG black). It never went back in the honda after its next change, but found use in my jeep T-case where it was stout, very quiet and seemed to hold up well. It always drained out as nicely as it poured in.
The Mobil 1 ATF has been reformulated several times since you used it, and is now "compatible" with most import transmissions without needing to add supplements.
i actually learned something today. thanks for real hard core discussion.
I have personally used both. I may have been the one to observe a slight MPG drop using M1 in a honda auto (with LG black). It never went back in the honda after its next change, but found use in my jeep T-case where it was stout, very quiet and seemed to hold up well. It always drained out as nicely as it poured in.
The Mobil 1 ATF has been reformulated several times since you used it, and is now "compatible" with most import transmissions without needing to add supplements.
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