dispersants
In an engine, the oil filter, but only for a limited time.
New fuel filter. Clean EGR valve and clean intercooler and pipes. Add injector cleaner to fuel and also fuel enhancer additive.
Lucas also makes a synthetic engine oil additive.. Yes.
Diesel additive cleans the injectors, therefore the engine is cleaner, giving a better performance.
Silicon
No
MotorSilk is a good engine oil treatment because it increases gas mileage and cuts emissions up to 10 percent. It also increases engine life and decreases friction and wear up to 80 percent. It is also able to clean the engine of sludge and varnish.
Seafoam products are pretty good.
Water
Oil contains detergents that clean your engine and suspend soot, deposits, & dirt in the oil. The air and oil filters remove most of the larger particles but some get in the engine and stay suspended in the oil which causes it to turn black. Oil is not only a lubricant and helps cool the engine, but it also keeps the engine clean.
the mother licks the children clean