I hate to post this up here and ask what fluid to use...but reading those old ones are way to confusing. some say atf 4 is ok. others no. so i went to autozone and they looked it up for me and said atf 4 is not right. that i needed some fluid they didnt even carry. so off to murrays and they looked it up and it said i could use some synpower 5-70 fluid or something. those were 11.99 a quart. does this sound correct?