Originally Posted By: CT8
Originally Posted By: OVERKILL
Originally Posted By: Pontual
Hear how quickier the engine turns with 5w30, as opposed to 15w40, specially for the initial 10 seconds. It gives a lot of spin while the pressure builds up. Even the tick-rattle of valve train is way more pronounced with the thinner oil.
Sound test comparison
https://www.youtube.com/watch?v=mKHwq1b3004
Start
You do realize an oil pump is positive displacement and when not on the relief, is moving essentially the same amount of oil per rotation whether it is 5w-30 or 15w-40 right?
Until the oils gets to the temperature where the heavier oil fails to move from the pan to the pump.
That's kind of funny coming from a guy in California, LOL! When's the last time you saw -30C?
Yes, while running straight 40 (or even a 15w-40) in Winterpeg when it is -40C might result in the oil failing to pump, this is generally not a concern for most people. The "fail to pump" point for a 15w-40 is still quite cold given that the MRV for a 15W is performed at -25C: