First-gen Database

First-gen Diamante Recommended Parts/Fluids
North American / JDM 3.0 Liter Trims
Battery	Group Size 24 Minimum CCA: 490 Group Size 34 and 25 should also work in a pinch.
Oil	All Climates: 5W-30 Appx. 4.5 Quarts w/Filter High quality oil only: Mobil 1 recommended. I better not see any Amazon Basics oil in your Diamantes!
Oil Filter	WIX 51334XP
Engine Air Filter	WIX 46057
Spark Plugs	NGK 6741 Laser Iridium or NGK 3764 Iridium IX (DOHC) NGK 3903 Iridium IX (SOHC)
Spark Plug Wires	NGK 8101 RC-ME78 (DOHC) SOHC used 3 different kinds so you will have to do car-specific research.

Note: These are Amazon affiliate links so if you use them I will make some pennies from the sale to help with hosting costs. However, these are the same products I would recommend in either case no matter where you buy them.