ASTM D4172 test method - Wear preventive (Four-ball). Common lab test used for marine lube quality assessment.
Formula
$$ \text{Method} = \text{ASTM D4172} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $ASTM D4172$ | Wear preventive (Four-ball) | - | ASTM / ISO / IMO |
Sources
- ASTM D4172.