Regular motor oil should be fine as long as the oil is changed every 3k
miles. Some places are only willing to spring for one every 7500 miles as
this is the minimum interval in most owner's manuals for "normal" driving
conditions. If this is the case, you should probably spring for the ones
in the middle and save yourself significant grief.
I'd do one every 5000km and pay for the additional oil changes as necessary
if they will do that. If they balk at doing an oil change every 5000km,
then just do one every 4000km and pay for every other oil change.
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