Can gasoline that you use in your car cause gunk build up on the valves like shell says it can their advertisement tv?

Yes, gasoline can cause gunk build-up on your car's valves. This is because gasoline contains detergents that help to keep your engine clean, but these detergents can also leave behind deposits on your valves if they are not used properly. In addition, if you use a low-quality gasoline, it may contain more impurities that can contribute to gunk build-up.

Gunk build-up on your valves can cause a number of problems, including reduced engine performance, increased fuel consumption, and engine knocking. In severe cases, gunk build-up can even lead to engine damage.

To prevent gunk build-up, it is important to use a high-quality gasoline and to follow the manufacturer's recommendations for fuel maintenance. You should also avoid using leaded gasoline, as this can damage your engine and contribute to gunk build-up.

If you are concerned about gunk build-up on your valves, you can take your car to a mechanic for a valve cleaning. This is a relatively simple and inexpensive procedure that can help to improve your engine's performance and fuel economy.