How much coolant do you use in a 1987 ford f-150 with fuel Ijected 302?

The exact amount of coolant for a 1987 Ford F-150 with a fuel-injected 302 engine isn't a single number. It depends on whether you're doing a full drain and refill or just topping off, and even slight variations in the system (due to things like different hoses or radiator size) can change the capacity.

However, a good estimate for a full system drain and refill is between 12 and 15 quarts of coolant/water mixture. Always check your owner's manual if you have it. Failing that, you'll want to locate your coolant reservoir. Often, it will indicate a "full" line. It's crucial to never overfill the system.

Important Note: Coolant should always be mixed with distilled water according to the manufacturer's instructions (usually a 50/50 mix). Using straight coolant or the wrong mix can damage your engine. Refer to your owner's manual or the coolant container for specific mixing instructions.