Yep checked oil in a couple things and had to add some. Poured a quart of 20W-50 in one rig and a quart of 30W in to it also. Boy needs to learn to keep track of oil. Any how the 30W oil poured out faster then the 20W-50 did. So why the heck did it pour better then what is suppose to be a thinner oil. Both stored side by side in a box in my unheated truck
- Thread starter old
- Start date
bobs old iron
Well-known Member
the 20-50 had 40 and 50 weight in it also,,which make it a little thicker and slower,, the 20 or 30 weight will run a little faster cause it's thinner/lighter than others.. just like home cooking oils, olive oil will pour different than veg oils.
guido
Well-known Member
Hello old,
There are some factors that will affect lube oil viscosisy.
1- Is the composition of the refined oil and its additives.
2- Its operating temperature.
3- Pressure(LOADS) between the two lubricated
surfaces.
Oil viscosity is the amount of change in the
oil within a set temperature, that is from 104 Deg F to 212 Deg F.
Even though the oil act different in the same temperature while pouring, it really is not a
indication of how they will perfom under actual lubricating condition.
Guido.
There are some factors that will affect lube oil viscosisy.
1- Is the composition of the refined oil and its additives.
2- Its operating temperature.
3- Pressure(LOADS) between the two lubricated
surfaces.
Oil viscosity is the amount of change in the
oil within a set temperature, that is from 104 Deg F to 212 Deg F.
Even though the oil act different in the same temperature while pouring, it really is not a
indication of how they will perfom under actual lubricating condition.
Guido.
I am also interested in what the manufacture(s) have to say. I have always been under the impression the viscosity of multi weight behaved like lower # when cold and higher # when at operating tempature. This sounds like somthing everyone here needs to know the facts about. Will somone volunteer taking on the fact finding duties with manufactures?
guido
Well-known Member
Hello old,
The muliviscosity oil are based only on their viscosity at 212 Deg. F. They are formulated to meet the W-grade designation of a realively thin oil , at a particular low temperature.
They meet the standards of the thicker non W grade oil at higher temperature, usually at 212 Deg. F. Even though the multiviscosity oil has a thinner base stock, the oil is tickned with additives. That my explain a little better why the multiweight oil flows ticker.
Guido.
The muliviscosity oil are based only on their viscosity at 212 Deg. F. They are formulated to meet the W-grade designation of a realively thin oil , at a particular low temperature.
They meet the standards of the thicker non W grade oil at higher temperature, usually at 212 Deg. F. Even though the multiviscosity oil has a thinner base stock, the oil is tickned with additives. That my explain a little better why the multiweight oil flows ticker.
Guido.
todd hamilton
Member
yeah and my Toyota uses 0W-20, how can an oil have 0 viscosity? Also that stuff is like honey when it's cold, no way you can check the oil properly unless the engine is warmed up.
Tom in TN
Well-known Member
- Location
- Southern Middle Tennessee
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
AMS Oil explanation of viscosity ratings
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
AMS Oil explanation of viscosity ratings
Rollie NE PA
Well-known Member
I use Pennzoil 10w 30 in my Jeep. It holds 6 qts. and I buy a 5 qt container plus a 1 qt container and for some reason the color of the oil is different between the two containers.
For what it's worth!
For what it's worth!
guido
Well-known Member
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.
Guido.
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.
Guido.
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.
MarkB_MI
Well-known Member
- Location
- Motown USA
With the exception of air-cooled engines like Hardleys and Lycomings, very few engines need a 50 weight oil, even in very hot weather.
Is it not amazing that so many can say so much and still leave folks scratching their head?
Below is "exactly"what Amsoil sums it up. Notice thier use of "simple english" and lack of attempt to imperess with a bunch of double talk.
If a motor oil passes the cold temperature or W (winter grade) specification for a SAE 15W and at 210° F (100° C)[color=red:a9879e8102] flows through the viscometer [/color:a9879e8102]like a SAE 40 motor oil, then the label will read 15W-40. Getting the picture? Consequently, if the motor oil performs like a SAE 5 motor oil on the reduced temperature scale and flows like a SAE 20 at 210° F (100° C), then this motor oil's label will read 5W-20. And so forth and so on!
I can't tell you how many times I have heard someone, usually an auto mechanic, say that they wouldn't use a 5W-30 motor oil because it is, "Too thin." Then they may use a 10W-30 or SAE 30 motor oil. At engine operating temperatures these oils are the same. The only time the 5W-30 oil is "thin" is at cold start up conditions where you need it to be "thin."
Below is "exactly"what Amsoil sums it up. Notice thier use of "simple english" and lack of attempt to imperess with a bunch of double talk.
If a motor oil passes the cold temperature or W (winter grade) specification for a SAE 15W and at 210° F (100° C)[color=red:a9879e8102] flows through the viscometer [/color:a9879e8102]like a SAE 40 motor oil, then the label will read 15W-40. Getting the picture? Consequently, if the motor oil performs like a SAE 5 motor oil on the reduced temperature scale and flows like a SAE 20 at 210° F (100° C), then this motor oil's label will read 5W-20. And so forth and so on!
I can't tell you how many times I have heard someone, usually an auto mechanic, say that they wouldn't use a 5W-30 motor oil because it is, "Too thin." Then they may use a 10W-30 or SAE 30 motor oil. At engine operating temperatures these oils are the same. The only time the 5W-30 oil is "thin" is at cold start up conditions where you need it to be "thin."
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