So, what is the best way to check the p/s fluid, and mineral based is the way to go? I think I am leaking P/S fluid and I want to top it off first and see if I can find the leak from there.

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1993 300D 2.5 Turbo
Daily Driver.... 238,000 miles and counting (Gone for an '03 Camry)
2000 ML-320
New Daily Driver...139,xxx and still in one piece...