Viscosity comparison between different motor oils at different temperatures
A SAE 40 oil is more viscous (resists flow more) than the rest and ends up with less viscosity in the hotter areas of the engine like the rings, bearings, turbos, valve guides and valve train.
The 5W-40 Synthetic starts with a lot less viscosity and maintains it better in the hotter parts of the engine.
To calculate the graphs of any four specific oils with their spec sheets and our graphic conversion tool, click here. (note, this tool uses Flash which may not work on some devices.)
This graph is for typical products in the market
To see more detail in a given temperature range, click the range you want.