I recently drained my power steering resevoir to change the two leaking hoses. Needing to refill the system, I am confused by all the different suggestions for the proper replacemnt fluid i.e., Penstomin, ATF, synthetic, Dexron#4, Amsoil, Mobil 1 Delvav, Type F., etc. Any suggestions on what I should use on my 89 928 power steering and automatic transmision Thanks,