Quote:
Originally Posted by juliusmichaelhonrada
But im using 10w-40 oil , i thought when cold its weighted as 10 , and when at 100 celsius it becomes a 40 weighted oil?
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Not exactly.
10W-40 means that the oil is multi-grade, due to some additives that reduce the drastic change in viscosity with changes in temperature.
The viscosity of liquids decreases as temperature increases.
For non-multigrade natural oils, the vicosity index can become double with a temperature drop of 5 Celsius degrees.
Please see these links:
https://en.m.wikipedia.org/wiki/Viscosity_index
https://en.m.wikipedia.org/wiki/Motor_oil