quote:bruce381
What equipment do you have ?
Make, Model, method you use, when calibrated and what standard (calibration) is used.
None of your posts reveal that.
If you are using rotary equipment the results will not match CANNON Fenske for opaque liquids.
Also what is your bath stabilization method and how you determine the sample is at that temperature ?
What cc of the fluid is used ?
Not to atack any of your measurements, just curious to know.
If you need to know we use
Cannon-Fenske Opaque
Viscometers
Calibrated CFOC (9721-F50) Series
150 for 100C and 300 model for 40C
The volume is 24 ml and the stabilization is 15 minutes.
Clock is computer syncho to Colorado clock, on off timing opto electronic.
And the standard:
Mfg. Date: 2/25/2010 CANNON® CERTIFIED VISCOSITY STANDARD
Viscosity Lot Use
Standard: S20 No.: 08104 before: 2/28/2011
Temperature
Kinematic
Viscosity Viscosity Density
Saybolt
Viscosity
°C °F mm2/s, (cSt) mPa ⋅s, (cP) g/mL seconds
20.00
25.00
37.78
40.00
50.00
98.89
100.00
68.00
77.00
100.00
104.00
122.00
210.00
212.00
43.49
33.98
19.65
18.02
12.63
3.797
3.720
37.53
29.22
16.73
15.32
10.66
3.084
3.020
0.8630
0.8598
0.8516
0.8501
0.8437
0.8124
0.8117
96.3 SUS
All data are traceable to the National Institute for Standards and Technology
Calibration date 3/31/2010
When one of the tests was reported as 23.5 we did test the same batch and when corrected for density it for sure is not 9.9. or 10.5 = all those reports reported at different times ON the SAME batch of fluid.
Can you explain why 10.5 and 23.5 and now 9.9 and 9.9 ? Clearly it is not consistent thus
Understanding Significance of Expanded Uncertainty is in order !
Once you have made error, is the first meacurement error, the second, the third, or all of them ? How about the average of the first two ? = 17 ???
All I can say different means of testing result in different values for someting that is NOT absolute like "viscosity".
But then people that claimed SAE 5W-50 is to thick (we always refer to is as "apparent" viscosity) should now have no fears to pour it onto ordinary SAE 30 applications.
We are not fanatics about numbers, just long term performance - test it again USED 5 and 10 years form now and then make up your mind about what really matters - I have only had 32 years of personal use in vehicles of all makes and models - and NO OIL CHANGES - it is what matters to me, what is in the lube or how it looks is of no importance if it works.
And at least 68,000 people could not care less what viscosity you may think SynLube is, really they do not !!!
As of todate 32 people bought SynLube for their vehicles as a result of this insane thread if it was paid for advertisement it would ahve earned $950.40 in commisions (BITOG is only at $$98.50)
Since ALL our sales are direct or through few dealers we do know where every single sale comes from - everyone !!!
Just ask Pennzoil if their $4 million commercial or the $1,500 "donation" to Helen paid of yet ?