BMW E30 power steering and steering rack
Why is oil leaking from under the E30 steering rack boot?
The oil comes from the rack's internal seals, which have worn loose. There should be no oil inside the boot. Replacing just the boot or using a fluid additive will not stop the leak; the rack's seal kit has to be renewed.
What oil is right for the E30 power steering?
The E30 power steering takes Dexron II class ATF, the same as 220. Mobil ATF also works. The system can be flushed until clear red oil comes out of the return hose.
Why does the steering rack knock or have play when driving?
The play usually comes from the inner track rod end. It is replaced separately, and torn boots are renewed. The whole rack does not need replacing. Adjusting the rack cannot remove play caused by wear.
What does it take to add power steering to an E30 without it?
You need a power steering rack, a power steering pump and bracket, a universal joint, a reservoir, hoses, a pulley and a belt. Some models also need a cooler. Parts can be adapted from the E36.