Car care tips
As a car is driven, the level of contamination in the engine oil constantly increases. The oil filter removes particles as the oil passes through the filter, but over time, oil additives are used up and the oil itself can start to degrade (oxidize or thicken). At that point, the oil can no longer do its job and must be changed. The rate at which contamination and additive depletion occurs depends on many variables. Driving conditions may vary greatly and have a direct effect on the useful life of the oil. Other factors include the precision of ignition, fuel injection or carburetion adjustments, air cleaner service and the general mechanical condition of the engine.
Oil should be changed before the contamination level reaches the point where engine damage can result. Because it is difficult for the individual motorist to determine when the contamination level is too high, automobile manufacturers provide recommended oil change intervals. These change recommendations vary by model year and manufacturer.
Recommended intervals and mileage limits also vary with the type of service under which a car operates. More frequent oil changes are recommended for severe service.
The VI number is typically used only as an indicator. The actual performance results of low-temperature pumpability tests and high-temperature wear tests for engine oils are better predictors of good performance in an engine.
Generally, multigrade oils (0W-40, 10W-30, etc.) will have high viscosity indexes. Monograde oils (SAE 30, 40, etc.) will have lower viscosity indexes.
Mobil 1™ performance record
Mobil 1™ is engineered to keep your engine protected and performing under the most demanding conditions. Scroll through some tests that corroborate our claims, helping you understand why we say that you can get outstanding engine performance with Mobil 1™ .Know more