The Difference Between Shell Engine Oil 5w30 and 5w40

[DiTyler]

So the biggest difference between 5W-30 and 5W-40 engine oils is their viscosity at 100 degrees Celsius, with 5W-30 having better fluidity. This may be caused by insufficient oil volume or excessively high engine temperature. Here is some extended information about engine oil: 1. Increased fuel consumption: When adding engine oil, the oil level should be between the upper and lower limits on the dipstick. If too much oil is added, the oil volume will expand as the engine temperature rises, increasing pressure in the oil chamber and operational resistance, which can reduce vehicle power and increase fuel consumption. 2. Overfilling oil: If too much oil is added, the crankcase breather pipe may leak oil, and increased crankcase pressure can cause oil seals to loosen due to oil pressure, leading to oil leaks. 3. Heat dissipation: Overfilling oil can affect engine cooling.