If Superflo is consistently at the bottom of the list, why does it cost more than Mobil Clean 5k in most stores? You can't blame it on advertising.
The product data sheets of both Superflo and M5k are essentially the same except for VI, but if you compare the MSDS' for 5w-30, there are more differences in favor of Superflo-
M5K (5/08):
Relative Density (at 15 C ): 0.86
Flash Point [Method]: >200C (392F) [ ASTM D-92]
Flammable Limits (Approximate volume % in air): LEL: 0.9 UEL: 7.0
Autoignition Temperature: N/D
Boiling Point / Range: N/D
Vapor Density (Air = 1): N/D
Vapor Pressure: < 0.013 kPa (0.1 mm Hg) at 20 C
Evaporation Rate (n-butyl acetate = 1): N/D
pH: N/A
Log Pow (n-Octanol/Water Partition Coefficient): > 3.5
Solubility in Water: Negligible
Viscosity: 61.7 cSt (61.7 mm2/sec ) at 40 C | 10.5 cSt (10.5 mm2/sec) at 100C
Oxidizing Properties: See Sections 3, 15, 16.
OTHER INFORMATION
Freezing Point: N/D
Melting Point: N/A
Pour Point: -24°C (-11°F)
DMSO Extract (mineral oil only), IP-346: < 3 %wt
Superflo (9/08):
Relative Density (at 15 C ): 0.861
Flash Point [Method]: >232C (450F) [ ASTM D-93]
Flammable Limits (Approximate volume % in air): LEL: 0.9 UEL: 7.0
Autoignition Temperature: N/D
Boiling Point / Range: N/D
Vapor Density (Air = 1): > 2 at 101 kPa
Vapor Pressure: < 0.013 kPa (0.1 mm Hg) at 20 C
Evaporation Rate (n-butyl acetate = 1): N/D
pH: N/A
Log Pow (n-Octanol/Water Partition Coefficient): > 3.5
Solubility in Water: Negligible
Viscosity: 65.2 cSt (65.2 mm2/sec ) at 40 C | 10.6 cSt (10.6 mm2/sec) at 100C
Oxidizing Properties: See Sections 3, 15, 16.
OTHER INFORMATION
Freezing Point: N/D
Melting Point: N/A
Pour Point: -42°C (-44°F)
DMSO Extract (mineral oil only), IP-346: < 3 %wt