I'm guessing, but I'd say that it's likely that he doesn't want to have to deal with purchasing new oil, and discarding the old oil.
(Though he would still need some oil to replace what's lost out of the canister)
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2001 Boxster S, TipTronic in Seal Grey aka "The Imp"
2001 TE50, ESS in (now) Grigio Titanio Matallizzato aka "The Golden child"
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