Top 10 Engine Additives That Actually Work (and 5 That Don’t)

🔗 Save $7,000 A Year By Keeping Your Old Car Alive Instead Of Replacing It: https://carlosherreracars.com You're standing in the auto parts aisle staring at rows of oil additives, fuel cleaners, and engine treatments — bottles promising more power, better mileage, reduced wear, and miracles in a can. You grabbed a few because the labels sounded good, poured them in, and never really knew if they did anything. Amigo, most of those bottles are marketing, but a few actually work when you use them right. I'm Carlos, a Mexican-American mechanic, and today I'll show you which additives are worth your money and which ones are just expensive oil. In this video: • The 10 engine additives that actually deliver results when used correctly • Fuel system cleaners that remove real carbon buildup vs. the ones that do nothing • Oil additives for high-mileage engines — which ones stop leaks and quiet lifters • Friction modifiers that work and the conditions where they make a difference • Diesel additives for lubricity and cetane boost in modern low-sulfur fuel • Engine flush products — the one type that's safe and when you should NEVER use them • Compression restoring additives that help worn piston rings vs. snake oil claims • The 5 additives that waste your money or can damage your engine • Stop leak products — the one formula that works temporarily and the ones that clog passages • Octane boosters that barely raise octane vs. the one that actually works for track use • Why most fuel injector cleaners don't reach the injectors the way they claim • Oil thickeners that mask problems instead of fixing them • When additives are a bandaid and when they're part of proper maintenance • How to read labels so you know what you're actually buying • The simple maintenance that eliminates the need for most additives No fancy products to sell you, no affiliate links — just the truth about what works, what doesn't, and what mechanics actually use in their own cars. Some additives have a real job to do. Most are just expensive placebos. Tell me in the comments what car you drive, what year it is, and which additives you've tried. I read every one.