A friend of mine, she’s out of work due to the bad economy, and needs to save $$$. I’m showing her how to do the routine maintance on her 1990’s Toyota econo-box. She’s inspected the fluid levels and discovered the power steering fluid is low. She’s never added to it before, so it probably just needs topping off after 20-odd years. The lid on the reservoir says to use Dextron II ATF. The auto store doesn’t sell Dextron II. They say Dextron II is illegal to sell in this state – and they only offer Dextron III, or Dextron 6 (which is a synthetic). The guy in the auto store said not to use the synthetic, as the synthetic may not mix well with the Dextron II already in there.
So should she use Dextron III for topping off her power steering? Will mixing Dextron III with the original Dextron II cause any problem?