Most maintenance will be the same. The two obvious differences I can think
of are the timing belt you've already mentioned and the tune up.
You should expect to pay an additional hour labor or so to replace the
timing belt on the V6, so that's not too big a deal. The real killer is
the tune up. The plenum must be removed to replace the spark plugs on the
V6. Expect another 2 or so hours of labor for the tune up (in addition to
the additional two plugs and a plenum gasket). Of course, the good news
is that this occurs only every 60k (or four years), so it's not all that
frequent, either.
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