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Old 10-10-2012, 11:46 AM   #16
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cSt - Centi-stroke has nothing to do with API's own version of oil 'weight.' cSt is a standardized measurement regardless of the fluid being measured or what organization does the measuring.

Originally Posted by BigRed03 View Post
"API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil."


Several instances around this forum, people use a specifically designed 5 or 10W40 oil from Europe in the getrag for racing. Since mines a DD, I use the ford honey.

From Amsoil:
European Car Formula 100% Synthetic 5W-40 Motor Oil (AFL)
Kinematic Viscosity @ 100C, cSt (ASTM D-445) 13.7
Kinematic Viscosity @ 40C, cSt (ASTM D-445) 82.9
Viscosity Index (ASTM D-2270) 171
Viscosity CCS, cP @ C (ASTM D-5293) 5314 (-30)
Flash Point C (F) (ASTM D-92) 228 (442)
Fire Point C (F) (ASTM D-92) 244 (471)
Pour Point C (F) (ASTM D-97) -43 (-45)
Noack Volatility, % weight loss (g/100g) (ASTM D-5800) 7.4
Four Ball Wear Test (ASTM D-4172B @ 40 kg, 75C, 1200 rpm, 1 hr), Scar, mm 0.44
Total Base Number 8.0
HTHS (cP) (ASTM D-4683) 3.8
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