ASTM D4741 vs ASTM D4683 HT/HS Amsoil vs Redline

[alpha6164]

I noticed that Redline reports their HT/HS numbers based on the ASTM D-4741 method while AMSOIL reports theirs based on the ASTM D-4683 method. Redline seems to be a tad higher for similar oil type and weight.

I wanted to know if Redline is getting higher numbers because their test methodology they are using is different or "easier" to get a higher number?

 

[TallPaul]

Here is what Redline told me back in 2005:

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Redline's Response:

Paul,

Both the ASTM D4741 and the D4683 tests will offer similar results.

Regards, Dave
Red Line Oil

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Then the question was asked,

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How close are the measured values when using D4741 versus D4683?

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And MolaKule responded with,

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Good Question:

Here is the actual wording from paragraph 14.6 "Relative Bias" of D4741-00:


Results from this test method were found, by interlaboratory studies to agree with those from Test Method D 4683 at both 100 C and 150 C. They can be expected to give, on average in the long run, the same results for the same oil. D4683 says the same thing in paragraph 14.3 but adds another that correlation is the same with test method D5481 as well.

No deltas were given for D4683 verses D4741 or D5481.

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On Feb 3, 2005, in this thread.

Now will the Moderators please sticky note this thread.

 

[G-MAN]

I'll sticky it once it gets moved from the New Member Forum.

 

[TallPaul]

Looks like a good time to sticky this one, as this question comes up about every six months or so.