However, you’re still messing with the oil’s viscosity and additive balance, so you should use these products with caution. Also, as with fuel additives, it’s important to read the instructions.

Engine oil additives make all sorts of promises about helping your vehicle's motor last longer and increasing your gas mileage. Here's what you need to know.

SHOULD I USE HIGH-MILEAGE OIL IN MY CAR? ... features extra anti-wear additives as well as additional dispersants and detergents to help break up any sludge and keep things clean.

Is it worth adding a transmission additive? Well, as it is with a lot of automotive questions, it depends on your car's situation. Additives that have friction enhancers in them or claim to stop ...

Marvel Mystery Oil changes the viscosity of the oil and can also affect the additive packages in modern oil. The problem is it could work great, or it could cause a problem, and there is no way to ...

Zinc additives are fairly common in oil, especially when treating a classic or high milage engine, ... Further, you should change the oil more often to help maintain this effect in such engines.