It depends on the climate but a 5W-30 works in most cases.
Dot 3 will be just fine.
low beam headlight bulb type: 9006
R134a
190 HP at 4,400 rpm, 4.3L, V-6,
Originally it would have had DexCool.
dextron mercron
A NAPA 1040 or the NAPA 1036 will do.
If the Blazer is gasoline powered the antifreeze can be any kind that is for sale for gasoline powered vehicles.
A/T uses Dexron III
A 2000 Chevrolet blazer with a 4.3l V6 would have come with a spin-on style filter. If you go to your local parts store, a WIX brand filter would be a part number 51036
5w30w
It depends on your climate but in most cases it would take 5W-30.