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I would say all fluids, oil, differential, transmission, strrring if it’s not electric. Then my other concern would be serpentine belts dry rotting and the same with any seals. Valve cover gaskets, oil pan gaskets, oil filter housing comes to mind at least on an N55. I’m sure there would be other things to look at, but those would be my main ones I can think of currently.
If you’re really interested, do a thorough inspection all around and check for any smoking in the engine bay or any obvious signs there might be leaks in any of the systems.
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