CST question

[drifter420]

K.. so does CST mean Viscocity right? so that doesn't tell bout the thickness of the oil right? So what does this mean?

M1 5w30 = cSt @ 40ºC 56 cSt @ 100ºC 10
XD-3 0W30 = 71cST @ 40degC, 12.1cST @ 100degC

that M1 5w30 has less viscocity? Or thinner (weight) ???

 

[XS650]

quote:

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Originally posted by drifter420:
K.. so does CST mean Viscocity right? so that doesn't tell bout the thickness of the oil right? So what does this mean?

M1 5w30 = cSt @ 40ºC 56 cSt @ 100ºC 10
XD-3 0W30 = 71cST @ 40degC, 12.1cST @ 100degC

that M1 5w30 has less viscocity? Or thinner (weight) ???

---

It tells you that the M1 5w30 is less viscous at 40C and 100C. You can also derive the viscosity index from the information there, but not much if anything more.

It's a little surprising considering the relative 5W and 10W ratings of the two oils, but you can't draw any conlusions about how the oils will behave at the sub zero F temperatures where the 5W and 10W ratings are established.

If the X3 were 12.4 @100 it would be an xW-40, if the Mobil were 9.2 @100 it would be an xW-20.

 

[drifter420]

Thanx.. so you said the XD-3 is more like xw-40 at operating temp. Do you know where I can get a chart of the average xw-30 viscocity should be? and xw-20 and so on?

[ December 21, 2004, 05:28 PM: Message edited by: drifter420 ]

 

[Dr. T]

Yes, good example. M-1 is thinner than the XD-3 at both temps....proving to the naysayers that using a 0W in all cases/all temps. is useless as it is actually thicker than the M-1 5W in this example.

 

[drifter420]

so based on that.. if my car is asking for 10w30 and 5w30 for winter.. and since XD-3 is thicker then M1, that means I can run it year round stead of switchin back to 10w30?

So there is no way of determining the 0w factor or 5w factor? ( other then the good ol freezer test? )

[ December 21, 2004, 07:05 PM: Message edited by: drifter420 ]

 

[XS650]

quote:

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Originally posted by drifter420:
Thanx.. so you said the XD-3 is more like xw-40 at operating temp. Do you know where I can get a chart of the average xw-30 viscocity should be? and xw-20 and so on?

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Do a Google seach for SAE J300 chart and you will find one. YOu may have to look at a few sites before you find the actual chart.

XD-3 is a viscous xW-30, it is still closer to an average 30 than an average 40, but not by much.

 

[TallPaul]

Nice J300 chart

 

[Dr. T]

It's determined by SAE and written on the bottle...check the chart for the requirements...