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[John C]

I wouldn't use Mobil 1 untill you fix the main seal problem, it's only going to leak more.

I had (and heard of others) problems with 4 prong spark plugs. I would get the wires anyway, you might upgrade your coil somewhere down the line.

Steering box: it's a PIA to replace the seals. I'm in the process of doing that on a spare box I have. You have two options; 1) if the leak isn't too bad you can add some Lucas Steering leak stop, it'll swell up the seals and stop it from leaking. I've used it many times and it works great; 2) get a rebuilt box from Meridian in CA. They sell them on eBay and they have great customer service. I have one on my white DI and it's fine.

Now, before you start any of these projects I would try cleaning the underside of the engine/engine compartment and make sure to identify all the leaks. The most common leak area for the power steering fluid is on the hose that attaches to the bottom of the fluid reservoir. Try getting some Zebra clamps, they're great!

The main seal is a big project, the gasket is probably around $25 but you have to seperate the engine from the tranny.