$120 seems resonable...i guess
cheapest i found the nissan ester oil from a dealer is $11.99+CAtx per quart
so that comes to about $80.00 for 6 quarts
add to that a good quality oil filter(K&N or Mobil) which is about $12.99+CAtax
which is abot $15.00
plus maybe $1.00 for a new gasket
so that adds up to $96.00 an oil change(WOW!!)
so savings of $24.00 plus the satisfaction of knowing you are able to change your own oil and you know it was done right(by you)