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Tractor Talk Discussion Forum

Re: Oil, 20W-50 and 30W why does the 30W pour faster in this col

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Tom in TN

02-21-2013 14:48:29

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Attached is a link to the AMS Oil website that explains viscosity ratings. It is a fairly comprehensive explanation.

What Guido said is a very good explanation of the differences, but if you're interested, you might also scan the information in the link.

Tom in TN

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03-08-2013 10:05:30

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 Re: Oil, 20W-50 and 30W why does the 30W pour faster in this col in reply to Tom in TN, 02-21-2013 14:48:29  
be careful!. that is NOT NOT an official AMSOIL website. that is a local dealer. Who knows where he got that info. I'm not saying its wrong but its not From AMSOIL. is the official website only

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pete 23

02-21-2013 16:09:25

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 Re: Oil, 20W-50 and 30W why does the 30W pour faster in this col in reply to Tom in TN, 02-21-2013 14:48:29  
I like that explanation on oil viscosity . Especially the part about oil shear of multi grade oils at high temp and what it does to the viscosity range. Good reason to have oil samples tested on heavy use engines that hold a lot of oil in the sump. Smaller engines, just dump it. One other thing, you can see how one particular 30 wt oil can be very close to the same viscosity as another 40wt oil if one is on the high side of viscosity range and other is on low. I think a lot of the multi-grade oils on the market fall into that category of just being over or under a line.

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02-21-2013 15:49:16

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 Re: Oil, 20W-50 and 30W why does the 30W pour faster in this col in reply to Tom in TN, 02-21-2013 14:48:29  
Hello Tom in TN,

Thanks Tom......... Hard to explaing all of the manufacturing process. I just touched on what is most relevant, and can remember. There are plenty of sites with much more info. I would stick to the oil co Or the API site.
There is much info out there not worth the bytes that they are taking up.


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