Miles Lubricants
Miles Lubricants Mil-Gear S 16 oz Gear Oil 80W-140 Yellow
Synthetic 80W-140 gear oil meets API GL-5, pours at -35 °F and flashes at 515 °F in a 16 oz bottle
- ColorYellow
- Synthetic formulation protects gears under extreme pressure
- API GL-5 rating meets heavy-duty differential requirements
- 80W-140 viscosity covers a wide temperature range
- 173 viscosity index keeps film strength stable
- 35 °F pour point ensures flow in severe cold
Mil-Gear S 16 oz Synthetic Gear Oil
This 16 oz bottle contains Miles Lubricants Mil-Gear S synthetic gear oil formulated to SAE 80W-140 viscosity. The fluid carries an API GL-5 rating and a viscosity index of 173 for consistent protection across temperature ranges. It is suited for differentials and manual transmissions requiring GL-5 performance.
Temperature limits and flash point
The oil maintains flow with a pour point of -35 degrees F for cold starts and resists thermal breakdown with a flash point of 515 degrees F. The high viscosity index helps the fluid retain film strength under heavy loads. These parameters define the practical operating envelope for the lubricant.
Replaces conventional GL-5 gear oils
The synthetic base formulation upgrades from mineral-based GL-5 fluids where extended drain intervals and wider temperature stability are needed. The jump is worth it for equipment seeing high shock loads or seasonal temperature swings that challenge conventional oil performance.
Highlights
- Synthetic formulation protects gears under extreme pressure
- API GL-5 rating meets heavy-duty differential requirements
- 80W-140 viscosity covers a wide temperature range
- 173 viscosity index keeps film strength stable
- 35 °F pour point ensures flow in severe cold
Specifications
| Brand | MILES LUBRICANTS |
|---|---|
| Color | Yellow |
Questions about this item
Should I choose the 16 oz bottle or a larger size?
The 16 oz bottle suits a single differential top-up; buy multiple bottles if the service manual calls for more volume.
What does the 80W-140 grade mean for my differential?
The 80W-140 rating means the oil flows at -35 °F for cold starts and keeps a 140-weight film at operating temperature.
Does API GL-5 limit where I can use this gear oil?
API GL-5 certifies the additive package for hypoid gears; do not use it where the manufacturer specifies GL-4 or a limited-slip additive.
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