It all depends what has been done on your previously.
Oil, Air filter (or clean if not standard), Transmission fluid are the most important ones.
I did the power steering fluid, new PCV valve, coolant when it was imported.
Fuel filter is worth changing if its never been done on a 100k car. Spark plugs would be worth a look to see what condition they're in.
My aux belt looks pretty sorry for itself so I've got one on order to change.
Valve clearance and a timing chain visual check by a garage is worth doing at 100k.
If you're handy with tools then cleaning out the ICAV is worth doing if you're getting any idling issues.
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