Questions regarding 0w40 oil

[tmontague]

Originally Posted by IllusionX

0w40 is 0 weight. 40 is the heat resistance.

You really want to look for something 10w, 15w or 20w.

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Why would you ever want to increase the cold weight of the oil? Even in 90* ambient temps that is still much lower than the 212* operating temp of an oil. A 0w would keep the "cold" start viscocity closest to operating temp viscocity tjat any higher number would.

Oils are thicker at colder temps even multi weight oils. A 5w means it flows like a 5 weight oil at 0* and a 0w oil flows like a 0 weight at 0*. It does not mean the oil weight is 5 or 0 at 0*. If that was the case than our passenger car pil would be thinner after being left in the freezer than it is left on the shelf

To the OP, are you monitoring pil pressure? If you are not then you have no reason to increase your oil weight above the factory spec. The only need for this is if you are suffering from oil pressures below Toyota's spec.