No, they do not release friction they reduce it. Some friction will always remain in the common modern internal combustion automotive engine. Engine oil additives actually reduce the amount of friction that can be very intense and harmful to a engine, especially when starting from cold. Chemical polymers and agents that make up the engine oil additives are designed and engineered to add a level of extra protection to the standard engine oil. However, a good name brand engine oil, installed into your vehicle with proper weight and viscosity and proper oil manufacturer recommended additives -which are already in motor oil from the manufacturer - is all that is needed. No other additives should be used unless the automobile manufacturer has suggested it's use.
The tires of a moving car experience the most friction with the road. This friction is necessary for the car to accelerate, decelerate, and make turns.
There are many fuel additives that you can use that will help your car burn less oil. Using high grade additives can help treat friction in your engine at the the actual source.
Interesting - static friction is greater than moving friction; but if the car is not in a skid, then the part of the tires in contact with the road is not moving ... thus static friction holds in both cases.
all off it of course
to reduce friction
You can always try fuel additives to clean out the gunk in your car's engine.
the front boot of the car increases the friction on the car
One of the ways to reduce friction in a car engine is to add an oil lubricant. The oil lubricant can be mineral or synthetic but they help the engine parts to move without too much ware. Another way would be to add an engine oil cooler.
A common example of friction in a car is the friction between the brake pads and the rotors when you press the brake pedal to stop the car. This friction helps convert the car's kinetic energy into heat, slowing down the car.
The reaction force to the friction acting on the car is the friction force acting on the road. It acts on the car in the opposite direction to the friction force acting on the car.
If additives are so great why doesn't the vehicle's manufacturer add them from the start?
For the most part yes, but the car depending on the aerodynamics of the design can resist most of it.