I'm in Lansing with a gravel outdoor parking lot that collects
water when it rains.   Tools for an oil change are no
big deal.  I don't know about your conversion, but what do you need
besides one or two sockets and maybe a filter wrench (or to get
messy a screwdriver and a hammer)?  Go down to a pawn shop and
pick up a couple basic things.  I'd never drive any car anywhere
without 'em.  And I wouldn't even drive to the pawn shop "if the oil
is almost gone".
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Steve