Why does STP make two different oil treatments? What are their differences?
There are two separate and distinct STP® Oil Treatment products: STP® Oil Treatment (in the blue bottle) helps protect against engine wear with a high-viscosity formula, which fights metal-to-metal friction, by providing a thicker cushion of oil between moving engine parts. It can be used in all cars, trucks and SUVs. STP® 4-Cylinder Oil Treatment (in the red bottle) also helps protect against engine wear by increasing oil viscosity, which provides a thicker cushion of oil between moving engine parts and reduces metal-to-metal friction. It counteracts oil thinning and also contains additives to boost motor oil’s anti-wear protection. This product is optimized for 4-cylinder engines.
