To find leaded gasoline you would have to be off North America so I don't think this should ever happen, its been banned for decades
If you put leaded gas in an engine that is designed to run on unleaded gas, while the engine will run, it will not run optimally and you will ruin the catalytic converter.
No. It requires unleaded. If you put in leaded the only thing it would hurt was the catalytic converter. There is no on-highway leaded gas anymore--it's illegal to sell it. Aviation gasoline is leaded, as is racing fuel, but not road gas. The VR6 has two knock sensors on it. Knock, which is caused by running too low octane, trashes engines, and the knock sensors are there to retard the spark and get rid of knock. You won't hurt the engine by putting regular unleaded in it, but it won't run as well as it could with more-expensive gas in it.
It can effect engine performance and fuel burning efficiency.
Where are you at? I haven't seen leaded gas or petrol since I was in grade school. They used to call it "regular" and there was that and diesel until they decided the lead in gasoline was bad for us and started offering unleaded. Eventually, every gas station in the U.S. phased regular gas out. If you have an old car from the days of leaded petrol, you'll probably have to put unleaded in it some time (unless you live in a country where they still have leaded gas at the stations). If you put unleaded gas in an old car, you can get a fuel additive to protect the engine from the harsher fuel. Over time, using unleaded in an old engine can cause some of the gaskets to dry out and start leaking. It won't hurt just one time, but it's an accumulative effect if you do it all the time.
In 60's terms you could put regular or Hi-test in it. Leaded of course. Unleaded is supposedly hard on an engine not designed for it. There might be additives available to offset that.
No. Do not put unleaded gas in a diesel tank.
as far as I know you put different seats on your valves, from soft to hard I think.
No , it will wreck the catalytic converter , use " regular " unleaded , 87 octane
Empty your tank out, drain the fuel lines, as the gasoline will damage your diesel engine.
If the engine is a diesel use diesel fuel. If the engine is a gasoline engine use unleaded gasoline.
It depends on which year your F150 truck was built. If it was built before the days of unleaded only engines you have to put in an additive available from the car part stores. You cannot run unleaded only gas in an engine designed for leaded gasoline. If you have a manual for the truck it will tell you what grade to put into the tank. Most take non-premium gasoline. See your local car parts store or call your Ford Service department.
Why would you do this? This is difficult to do by accident as the filler nozzle, through which unleaded fuel is delivered, and the filler pipe on the car are both narrow. The wider nozzle used with leaded fuel and diesel just will not fit. Leaded fuel will quickly destroy the catalytic converter and O2 sensors. What other damage will be done is hard to say. Use unleaded and forget leaded fuel.