Use a genuine Mazda filter ONLY. Use 10W-30 dino oil if the temps go below 30 degrees regularly (or even 5W-30...this is stated on the underhood placard) and you can use 20W-50 in really hot weather, where the temps won't be below 60 - 70.
Takes about 4.5 U.S. quarts for a full change. Put in 4 quarts, run it a while, let it sit, then check it and add as necessary.
'93 Montego Blue Mica
Yes, it's an automatic and yes, it's fast.