I'm in the same situation -- dealing with age more than miles.
My (new to me) '02 S just hit 13K miles! I also wanted to be pro-active, but ended up only changing the oil & oil filter, cabin filter, engine air filter and brake fluid and tires.
I didn't do the coolant because its "lifetime". But that still means 6 years. So I will do that sooner rather than later.
I understand that the '02 and later does not have a replaceable fuel filter. I tried to get that done but my mechanic just smiled at me.
I have mixed feelings on spark plugs. My dealer quoted me $1,000 to change them. Seems they are rather difficult to reach... I suspect that I'll do a coolant flush and change my plugs by the time I hit 30K in two years. Against most advise, I might pro-actively change the MAF, O2 sensors and AOS by that point too.
Have you considered replacing belts?
I can't offer anything on the gearbox. My is very smooth, even when cold.
Good luck with your car.
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