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I am not getting the answer I am looking for. 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.

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

If they don't understand my question then say so , I am not argumentative about this only flippant responses.

I am not trying to get oil thinner. What I want to know is if the oil only gets to 140 degrees at what grade is the 20w-50 oil at that point . You buy oil in a certain grade not cSt at the parts store.

What is so hard about a simple answer to the question ,I'm not trying to invent the wheel. As the temp. climbs the multi grade oil is supposed to meet the requirement of the next grade of oil as not to thin out. I have a condition in a vehicle of the oil running at lower temperatures and i am...

Wrong , as temperature climbs it meets the requirements of a higher grade oil. As at what temperature would a 20w-50 oil be at 40 grade as it can't be at 20 ,30,40,50 at the same temperature.

Let me try again . I am looking for the grade change of a 20w-50 oil at what temp. it changes from one grade to the next. Iam trying to figure if the oil will make it ti to 50 grade when running at a lower temp.

Oil has always been called 10 weight 30 eight and so on.

10- 20 -30 weight etc.

I need results in SAE not cSt as cSt means nothing to me.

Those temps don't help and I would like answer in SAE viscosity

a 10w-40 and a 20w-50

a multi grade oil.

Is there a chart that plots viscosity vs. temperature in SAE only. I'm wondering where the viscosity would be at a temperature at around 140 degrees.

I have used a couple of drops of break free a gun lube.