Oil... how does it work? [split]

[TurboTravis]

@Vovchandr

Show me a clause where it says that viscosity ratings for fluids only work for fluids at the same temperature otherwise the numbers are irrelevant.

Viscosity test doesn’t care what temperature the fluid is at. It just measures how fast it goes through the tube.

Where are you getting the information that the viscosity numbers are incomparable if the fluids are at different temps? That makes no sense.

This honestly feels like talking to PJB about getting a better job.

A 5W30 oil is a multigrade oil that CHANGES VISCOSITY WITH TEMPERATURE.

IT’S A DIFFERENT VISCOSITY AT ZERO DEGREES THEN IT IS AT 210 DEGREES.

IT’S A SAE 5 AT ZERO DEGREES. IT’S AN SAE 30 AT 210 DEGREES.

AN SAE 5 OIL AT ZERO DEGREES IS THICKER THAN AN SAE 30 AT 210 DEGREES.

Go get a quart of SAE 30 and a quart of 5W30. They will flow the same at 210 degrees, but the 5W30 will flow much better at zero degrees than the SAE 30 at zero degrees. Why? BECAUSE IT’S A MULTIGRADE OIL THAT CHANGES VISCOSITY WITH TEMPERATURE.