When it comes to finding out whether drivers should use engine flush products or fuel additives, the internet will send you round in circles. Some say the products, added to a car’s oil or fuel to clean the engine’s internal moving parts and boost performance, are worth their weight in motor-protecting gold. Others claim they’re not worth the time or the effort.
The basic theory behind both these kinds of products is that by running them through the engine, you’ll clean out any deposits left by the engine’s combustion process. Proving whether they work is easier said than done. Here’s what the experts say.