Millers Classic Differential Oil 85W-140 GL-5

Heavy 85W-140 GL-5 differential oil for classic hypoid axles

Millers Classic Differential Oil 85W-140 GL-5 is a mineral extreme-pressure oil for hypoid differentials in classic vehicles, with a viscosity profile chosen for classic-vehicle requirements.

It is supplied in 1 L and 5 L packs and is used undiluted.

Key properties

• Grade: SAE 85W-140, API GL-5, mineral base oil
• Viscosity: 390 cSt at 40 °C, 27.2 cSt at 100 °C, viscosity index 97
• Specific gravity 0.908 at 15 °C, pour point -18 °C, flash point 200 °C
• Described as non-aggressive to yellow metals
• Low friction and reduced oil loss, according to Millers Oils
• Packs: 1 L and 5 L

Choosing the right oil

The product is for hypoid differentials that call for an extreme-pressure oil at GL-5 level. 85W-140 is a heavy grade: it is chosen when the manual or axle maker names it, for example for worn, high-torque axles where a thin oil would leak or shear. It is not a general-purpose gearbox oil.

If your manual names 80W-90 or SAE 90 for the differential, choose the matching product from the shop instead: the Millers Classic Differential Oil EP 90 GL5 covers the lighter grade. And if the unit is a limited-slip differential, check whether a friction-modified or specific limited-slip oil is required before filling.

The oil is not meant for gearboxes that specify GL-4 oil.