Cal.240 is an in house PP-though the basis caliber was bought from Universal AFAIK-,
the watch is 8 years old ,all lubricants are dried or disappeared ,I m confident the watch will run for a certain period of time but movement parts will worn extensively.
I bought a 10years old Rolex years ago -from an AD- we agreed he makes a full movement service FOC,just for the peace of mind.I was a cheap date since an old stock watch requires no new parts just lubricants and seals.
Back to your question , if I d be in your shoes I d ask Patek to perform the service ,you may can get tis cost as discount from your purchase price .
Others will add their opinion.
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