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Your "operators manuel" should explain which type of oil to use. I have a 96 Buick, LaSabre, that uses 10/30 wt.
Regular antifreeze such as, green, or red!
A 2000 Buick uses Dexcool.
Green
This use to happen on our GMC Suburban. Turned out it was the battery connection. Make sure battery connections are tight and that the battery is clamped down so that it does not move around.
You can use Prestone.
Use the green color.
The official coolant is Dex-Cool (orange). However, you can use yellow. Do not use green
Any brand-50/50 mix. you can buy it ready to use if you like.
Green.
You should use the orange Dexcool, if you cant get it, you can use the green stuff as long as all other coolants are out of your radiator. Mixing different colored antifreezes makes a viscous, sludgy antifreeze.
Yes, unless you live in a cold climate. In that case buy as close to a 770 CCA battery as you can.