General Oils - Data
Mineral Vs Synthetic (Some comparisons)
For purposes of comparison, we have taken a well-known synthetic engine oil, Amsoil 10W-40 synthetic, and contrasted its characteristics with those of several prominent 10W-40 conventional motor oils. Below is a condensed summary of the results of several closely-monitored field and laboratory tests:
| Test | Amsoil Synthetic 10W40 10W40 | Petroleum based oil | |
| 1. Effective lubrication range | -60 to +400 F | 0 to +300F | |
| 2. Visc. incr. after 64 hr. | 9% | 102 to 400% | |
| M6 | 10 | ~ | |
| M7 | 11 | ~ | |
| M8 | 13 | 12 | |
| M9 | 14 | ~ | |
| M10 | 17 | 14 |
Amsoil Synthetic Petroleum
10W40 10W40
1. Effective lubrication range -60 to +400 F 0 to +300F
2. Viscosity increase after 9% 102 to 400%
single-sequence (64 hour) Olds III-D Test
3. Wear (mg. weight loss, Falex test) 1.1mg 3 to 6 mg
4. Fluidity @ -40F flows freely solid
5. Volatility (evaporation @ 300F 1% 28%
for 22 hrs)
6. Crankcase Temperature (Track Test) 240F 290F
7. Flash Point (D92 test) 470F 400F
8. Oil consumption (50,000 mile test) 42% less than -
petroleum oils
9. Intake valve deposits (50,000 miles) 32.1 grams 75.5 grams
