No matter the condition of your 1984 Bonneville, OPGI has the Oil & Fluid Coolers you need to boost performance and get you back on the road. We currently carry two Oil & Fluid Coolers to choose from for your 1984 Bonneville, and our Price Match Guaranteed prices range from as little as $48.99 up to $219.99. OPGI offers Performance by OPGI plus one other trusted brands of Oil & Fluid Coolers for your 1984 Bonneville, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Oil & Fluid Coolers in person.