@tomfiii , Probably not a good idea to start a thread with an issue you are having only to become argumentative over it………
Not hating, just saying………..
viscosity charts
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Not hating, just saying………..
This is now just trolling the board.
The point of a multi-grade oil isn’t that it thins out less as the temperature increases, it’s that it thickens less as the temperature decreases. You have a fundamental misunderstanding here. In your example above it’s a 50-grade oil all day long.
If they don't understand my question then say so , I am not argumentative about this only flippant responses.@tomfiii , Probably not a good idea to start a thread with an issue you are having only to become argumentative over it………
Not hating, just saying………..
To give you the exactly correct answer to your question. It will be a 20W-50 at 140 degrees. It will be a 20W-50 a 140 degrees Kelvin, it will be a 20W-50 at 140 degrees Rankin, it will be a 20W-50 at 140 degrees Celsius, it will be a 20W-50 at 140 degrees Fahrenheit.
I know what multi grade oils are supposed to do. What I want an answer to is about what goes on at a lower operating temperature , as I can't understand cSt ratings
Please re-read your responses…….over 13 people helping you with your issue and not ONE positive response to their assistance…….Again, just saying…….
I am not getting the answer I am looking for.Please re-read your responses…….over 13 people helping you with your issue and not ONE positive response to their assistance…….Again, just saying…….
Of course 20w-50 is 20w-50 at different temperatures,BUT it acts differently at different temperatures, 20w at cold temps and 50 at operating temp.
You are not asking the question you are looking for an answer to.
A 20W-50 acts like.....a 20W-50 at all temperatures. The 20W and the 50 have nothing to do with one another. As you said, the 20W pertains to low temperatures and the 50 pertains to high temperatures.
The question you are trying to ask is: "What estimated viscosity would a typical 20W-50 be at 140F and what SAE grade would match that cSt viscosity at 100C?"
The answer to that question is: Maybe an SAE 60, or off the SAE scale entirely.
Or maybe your question is: What SAE grade would have the viscosity of an SAE 20W-50 at 100C but at 140F?
If that is the case, the answer is who knows. Maybe an SAE 30.
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You technically do buy an oil that's within a range of cSt values because, as per J300 which has already been posted, that's how the grades are defined, within that range, always at 100C.
What you are asking for is what is the EQUIVALENT grade that the 20w-50 would be at say 60C/140F. Well, the short answer is there isn't one, as J300 ends at SAE 60 and that tops out at 26.1cSt.
If we look at say Castrol GTX 20w-50:
And you plug those values into the Widman Operational Viscosity calculator which I already linked you, this puts us at 64.74cSt @ 140F, which, as you can see, is almost 3x thicker than the heaviest grade listed in J300.
And before someone's head explodes, those grades in your chart above that are appended with a "W" are monograde "winter grade" oils.
by far the most entertaining thread I have read on here in a while.
OP - maybe you could just tell us the brand and grade you are buying (or interested in) so we can do the math for you? I think many folks responding to this thread know what you are looking for, but we can't answer your question without knowing exactly what has been asked for already several times (which we could look up if you shared the brand and grade you are looking for).
OP - maybe you could just tell us the brand and grade you are buying (or interested in) so we can do the math for you? I think many folks responding to this thread know what you are looking for, but we can't answer your question without knowing exactly what has been asked for already several times (which we could look up if you shared the brand and grade you are looking for).
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