Bob4x4 said:
I have been in the automotive industry for almost 30 years,Amsoilman please explain to me how none of the listed fluids(in the amsoil site) are interchangeable according to the OEM's and many of those OEM's have bulletins about incorrect fluids causing irratic shifts and or shudders,that yours will work universally.
Bob
Unlike motor oils, which are tied to API and SAE specs, ATF has to meet the OEM specs to which the ATF is going to be used in.
In the case of Ford Mercon for example, "Flash Point", "Brookfield Viscositties", "NOAK Volitility", (ABOT) "Aluminum Beaker Oxidation Test", "Friction Durability Evaluation tests" are all used to determine if the ATF fluid will meet/exceed the Ford Mercon requirement.
GM as well as Chrysler uses some of these same tests, but have differing limits.
Just to show you some of the mercon requirements for the ABOT, which has
SIX important factors, the first is the running time. The Mercon spec requires the fluid be exposed to high temperatures in an aluminum beaker for
300 hours. After heat exposure, several measurments are made on the test fluid to test the fluid's resistance to oxidation.
PENTANE INSOLUBALES
Pentane is a solvent in which ATF is soluble but oxidation products and metals are insoluble. Insoluble materials form solids that precipitate out of the pentane/ATF solution. The solid materials are wieghed. Since most of the wieght comes from oxidation products, the weight of the pentane insolubles indicates the degree to which the ATF oxidized in the aluminum beaker test. The Mercon spec required a maximum for pentane insolubles of 0. 5% by weight. The Amsoil was 0. 23% by weight, indicating very little oxidation after 700 hours!.
(TAN) Total Acid Number indicates a fluid's acidic potential. A fluid's TAN increases as a result of oxidation. Mercon spec allows a 4 point increase in acidic potential. Amsoil exhibits a 0. 62 point increase after 700 hours.
VISCOSITY INCREASE
Fluid viscosity increases with oxidation. Oxidation creates solid materials that thicken the fluid. Mercon spec requires no more than 40% viscosity increase. Amsoil shows no Viscosity increase after 700 hours.
COPPER STRIP CORROSION
A copper strip is bathed in the test ATF and the degree to which is corodes is determined by its color and general appearance after exposure. The evaluation schedule ends at 3d, total corrosion. The Mercon spec is 3b maximum, general blackening. Amsoil exhibits a 1b rating, slight discoloration, or negligable copper corrosion after 700 hours.
There are other tests as well, but those mentioned above are pretty much what the OEM's use, only the methods and limits are different. GM calls their high heat tests (THOT) Turbo Hydromatic Oxidation Tests. Chrysler pretty much follows GM, with the exception of their friction durability tests used to evaluate the shift characteristics of ATF.
Hope this helps some.
Wayne
amsoilman