For your clutch...ive got a husqvarna 390 automatic with brass centrifugal clutches, its recomended not to use atp but ohlins shock absorber oil, (there is a special husky auto oil but it costs a lot) some differentials need a special oil aswell , like my iveco daily diff which has brass in it and some 50's and 60's peugots, i think they recomend a "jl" oil ou something like that, normal gearbox or diff oil wears the brass by holding the brass in the oil instead of letting it fall to the bottom of the casing,
I tried atp in my auto and can confirme this when changing oil.