Choosing oil and fluids for a Pontiac Bonneville remains the same from model year 1992 to the Pontiac Bonneville's demise in 2005. While most of the steps may apply to earlier models as well, owners of vintage or specialty vehicles may have unique maintenance needs.
Change your engine oil at specified intervals, using an API certified SAE 10W30 viscosity grade. The Pontiac Bonneville is unique among other passenger cars because 10W30 is the preferred, not alternate, engine oil viscosity. If temperatures are expected to fall below 60 degrees Fahrenheit before your next oil change, 5W30 is suitable, but don't use other viscosities such as SAE 20W50.
Charge your Bonneville supercharger with Supercharger Oil, GM part number 12345982.
Mix clean water--preferably distilled--with an equal portion of GM Goodwrench or Havoline DEX-COOL silicate free antifreeze.
Top off your brake fluid reservoir as necessary with Delco Supreme 11 DOT 3 brake fluid. Make sure to wipe off the top of the reservoir lid before filling, to ensure that no debris falls into the reservoir and clog your brake lines.
Keep your automatic transmission running smoothly with DEXRON-III automatic transmission fluid. While most vehicles allow the use of automatic transmission fluid in the power steering system as well, you shouldn't do this in the Pontiac Bonneville.
Add GM Power Steering Fluid, part number 1052884 or 1050017 for pint or quart sizes respectively, as necessary.
