For a high mileage vehicle such as yours, we recommend Berryman B-60 High Mileage Fuel System Rejuvenator (part #7516) every 10,000-15000 miles. This fuel additive contains our strongest detergent package and thoroughly cleans fuel injectors, intake valves, and combustion chambers.
For regular maintenance, you should add a can of B-12 Chemtool Fuel Injector Cleaner (part #0116) every third fill up. This is our flagship fuel additive, great for everyday usage for cleaning fuel injectors and intake valves.
You will not use a fuel additive to clean the throttle body. Please see this link for more info
https://www.berrymanproducts.com/does-cleaning-throttle-body-make-a-difference-in-your-cars-performance/
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