Viscosity.?
This has nothing to with cars. It's for chemistry class.
Which is more viscous, 10w-50 oil or 10w-30 oil?
Both of them are stored at room temperature.
Also, what is HD-30 oil? Like what is the difference from the prefix being 10w or being HD?
The higher the grade number, the higher the viscosity. So 10W-50 is more viscous than 10W-30.
HD just means heavy duty. It is for applications involving high temp or heavy duty work such as hauling boats or campers at high speeds for an extended period of time.
Here's everything you ever wanted to know about motor oil: http://en.wikipedia.org/wiki/Motor_oil
This is a tricky question. The two oils operating at a lower temperature will have the same viscosity, but at higher temperatures,10w-50 will be more viscous.
And here's why:
The prefix "w" is used in multi-grade oil specifications to denote the viscosity rating of the oil in the winter, or at colder temperatures. It represents the rating of the less viscous particles in the oil. The second number (without the "w") denotes the heavier or thicker particles in the oil that are needed when operating in higher temperature. The two numbers used together denote the multigrade rating of the oil. 10w-30 has a low temperature viscosity rating of 10 and high temperature viscosity rating of 30. The other, 10w-50 has the same low temperature viscosity rating but a higher high viscosity rating of 50. Since 50 is higher than 30, it's going to have a higher viscosity at high temperatures. The reason being is that both oils operate as a single grade oil (in this case 10) when the temperature is low but when the temperature is high one operates at a rating of 30 while the other operates at 50 so it will be more viscous at that higher temperature. The ratings 30 and 50 do not matter when the temperature is low because the other grade that has been added to the oil (in this case 10) is working. I hope this makes sense.
I'm not too familiar with HD oil but I believe the HD is a type of oil used for engines that run on butane, propane, or LPG. I don't think it has anything to do with the prefix "w". The prefix "w" is typically only used on multigrade oils to denote the lower temperature viscosity of the oil. Since HD oils are single-grade they won't be labelled with a "w". However, this is only a best guess. I could be wrong.
And here's why:
The prefix "w" is used in multi-grade oil specifications to denote the viscosity rating of the oil in the winter, or at colder temperatures. It represents the rating of the less viscous particles in the oil. The second number (without the "w") denotes the heavier or thicker particles in the oil that are needed when operating in higher temperature. The two numbers used together denote the multigrade rating of the oil. 10w-30 has a low temperature viscosity rating of 10 and high temperature viscosity rating of 30. The other, 10w-50 has the same low temperature viscosity rating but a higher high viscosity rating of 50. Since 50 is higher than 30, it's going to have a higher viscosity at high temperatures. The reason being is that both oils operate as a single grade oil (in this case 10) when the temperature is low but when the temperature is high one operates at a rating of 30 while the other operates at 50 so it will be more viscous at that higher temperature. The ratings 30 and 50 do not matter when the temperature is low because the other grade that has been added to the oil (in this case 10) is working. I hope this makes sense.
I'm not too familiar with HD oil but I believe the HD is a type of oil used for engines that run on butane, propane, or LPG. I don't think it has anything to do with the prefix "w". The prefix "w" is typically only used on multigrade oils to denote the lower temperature viscosity of the oil. Since HD oils are single-grade they won't be labelled with a "w". However, this is only a best guess. I could be wrong.
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