While reviewing several recent UOAs, I noticed some variance in the "Should Be" values for viscosity parameters and thought I'd question Blackstone about this. Below is the exchange, what are your thoughts?
Originally Posted by Initial Question
I have a question regarding the "Values Should Be" for Viscosity. On this most recent sample, the oil in question is a 0w-30 which lists ranges of 58-65 @ 210*F and 9.6-11.9 @ 100*C. However, on other samples for this same weight some of the ranges you've provided as "should be" ranges are 57-67 and 9.4-12.4. I've also seen 53-59 and 8.2-10.2. Again I am seeing this for 0w-30 oils being used in other 2.0T Giulia.
Why are there variances to what these ranges are? Shouldn't the should be values be consistent with SAE viscosity guidelines?
Originally Posted by Blackstone
That's a good question. The viscosity ranges tend to be brand specific, and we'll tailor the "should be" values to what the oil's data sheet calls for.
Originally Posted by Follow Up
Thank you for the response, Joe.
Is there a reason Blackstone presents the information this way? Using Xw-30 as an example, SAE states that the viscosity (cSt) must be between 9.3 and 12.5 at 100*C. As I previously mentioned, some UOAs I have seen show a range of 8.2-10.2 being given. While 10.2 is certainly within spec, 8.2, according to the SAE would be considered an Xw-20.
It seems to me that it would not only be easier on Blackstone's end to utilize the SAE parameters, but would also deliver a more accurate analysis with regards to the industry standards.
Originally Posted by Blackstone
If every brand stuck to a strict SAE guideline, then it would be easier to just have a set range for every oil, but that's just not the case. And as such, we'll put up the viscosity range stipulated on the oil's data sheet as the "should be" range.
Originally Posted by Initial Question
I have a question regarding the "Values Should Be" for Viscosity. On this most recent sample, the oil in question is a 0w-30 which lists ranges of 58-65 @ 210*F and 9.6-11.9 @ 100*C. However, on other samples for this same weight some of the ranges you've provided as "should be" ranges are 57-67 and 9.4-12.4. I've also seen 53-59 and 8.2-10.2. Again I am seeing this for 0w-30 oils being used in other 2.0T Giulia.
Why are there variances to what these ranges are? Shouldn't the should be values be consistent with SAE viscosity guidelines?
Originally Posted by Blackstone
That's a good question. The viscosity ranges tend to be brand specific, and we'll tailor the "should be" values to what the oil's data sheet calls for.
Originally Posted by Follow Up
Thank you for the response, Joe.
Is there a reason Blackstone presents the information this way? Using Xw-30 as an example, SAE states that the viscosity (cSt) must be between 9.3 and 12.5 at 100*C. As I previously mentioned, some UOAs I have seen show a range of 8.2-10.2 being given. While 10.2 is certainly within spec, 8.2, according to the SAE would be considered an Xw-20.
It seems to me that it would not only be easier on Blackstone's end to utilize the SAE parameters, but would also deliver a more accurate analysis with regards to the industry standards.
Originally Posted by Blackstone
If every brand stuck to a strict SAE guideline, then it would be easier to just have a set range for every oil, but that's just not the case. And as such, we'll put up the viscosity range stipulated on the oil's data sheet as the "should be" range.