In the continuing struggle to understand the chemistry of oils, I'd like to solicit some opinions and educated analysis from those more knowledgeable than myself, so please bear with me. These are both Signature Series oils; from the Amsoil site, the specs say:
..............Signature Series...........................................0w30...........5w30
Kinematic Viscosity @ 100ºC, cSt (ASTM D 445) .......10.4 ............10.5
Kinematic Viscosity @ 40ºC, cSt (ASTM D 445) ..........58.3 ...........60.1
Viscosity Index (ASTM D 2270)...................................170.............166
CCS Viscosity, cP @ (ºC) (ASTM D 5293).....................5909(-35).....4426(-30)
NOACK Volatlty, %wt loss (g/100g) (ASTM D 5800)....7.6...............6.9
High-Temperature/High-Shear Viscosity
@ 150ºC, 1.0 X 106 s.-1, cP (ASTM D 5481)...............3.1...............3.2
To me, this report indicates the following. Please correct me if I am wrong:
Line 1: 5w30 is slightly thicker at 100C (perhaps statistically insignificant)
Line 2: 5w30 is also thicker at 40C
Line 3: 0w30 has a higher viscosity index by 4 points; (from this thread: BITOG viscosity index thread ) Does this indicate the 0w30 is somewhat better? Explanation would be great.
Line 4: CCS viscosity ( from reading here: BITOG CCS viscosity )is pumpability. 0w30's number is much higher, at 5909 BUT that is at -35. 5w30 is 4426 but at "only" -30. If temps were the same would this indicate that 5w30 pumps more readily?
Line 5, volatility: Shows lower for 5w30, indicating that the 5w30 would be more stable?
Line 6, High temperature shear viscosity, 5w30 shows higher, does this also indicate better stability?
I left out Flash and Fire Points since they are self explanatory, and Pour Points and TBN because they are identical.
Thanks in advance for the analysis.
..............Signature Series...........................................0w30...........5w30
Kinematic Viscosity @ 100ºC, cSt (ASTM D 445) .......10.4 ............10.5
Kinematic Viscosity @ 40ºC, cSt (ASTM D 445) ..........58.3 ...........60.1
Viscosity Index (ASTM D 2270)...................................170.............166
CCS Viscosity, cP @ (ºC) (ASTM D 5293).....................5909(-35).....4426(-30)
NOACK Volatlty, %wt loss (g/100g) (ASTM D 5800)....7.6...............6.9
High-Temperature/High-Shear Viscosity
@ 150ºC, 1.0 X 106 s.-1, cP (ASTM D 5481)...............3.1...............3.2
To me, this report indicates the following. Please correct me if I am wrong:
Line 1: 5w30 is slightly thicker at 100C (perhaps statistically insignificant)
Line 2: 5w30 is also thicker at 40C
Line 3: 0w30 has a higher viscosity index by 4 points; (from this thread: BITOG viscosity index thread ) Does this indicate the 0w30 is somewhat better? Explanation would be great.
Line 4: CCS viscosity ( from reading here: BITOG CCS viscosity )is pumpability. 0w30's number is much higher, at 5909 BUT that is at -35. 5w30 is 4426 but at "only" -30. If temps were the same would this indicate that 5w30 pumps more readily?
Line 5, volatility: Shows lower for 5w30, indicating that the 5w30 would be more stable?
Line 6, High temperature shear viscosity, 5w30 shows higher, does this also indicate better stability?
I left out Flash and Fire Points since they are self explanatory, and Pour Points and TBN because they are identical.
Thanks in advance for the analysis.
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