Millers Classic Gear Oil EP 140 GL4

SAE 140 GL-4 gear oil for classic gearboxes and differentials

Millers Classic Gear Oil EP 140 GL4 is a mineral SAE 140 extreme-pressure gear oil for classic gearboxes and differentials that call for an EP lubricant at GL-4 level.

It is sold in 1 L, 5 L, 20 L and 60 L packs and is suitable for brass and bronze components.

Key properties

• Grade: SAE 140, API GL-4, MIL-L-2105, mineral base oil
• Viscosity: 484.3 cSt at 40 °C, 31 cSt at 100 °C, viscosity index 94
• Specific gravity 0.905 at 15 °C, pour point -9 °C, flash point 238 °C
• Low friction and reduced noise, according to Millers Oils
• Viscosity selected for classic-vehicle requirements
• Packs: 1 L, 5 L, 20 L and 60 L

Choosing the right oil

SAE 140 is a very heavy gear oil. It is for gearboxes and differentials whose manual specifically names a 140 weight. Its pour point is -9 °C, so it is an oil for warm-weather running; if you use the car in cold weather, a thinner grade from the shop is a better option, provided the manual allows it.

Choosing between this and the 80W-90 GL-4 gear oil is a simple question of what the manual says. Do not choose the thicker oil as a way of quieting a worn box unless the manufacturer or an experienced specialist suggests it.

Larger packs suit clubs and workshops that service several vehicles.