Millers Classic Preservation Oil 20W-50

Storage and light-use preservation oil for classic engines and gearboxes

Millers Classic Preservation Oil 20W-50 is a dual-purpose mineral oil for engines that are laid up or used lightly. It is intended to protect petrol and diesel engines against rust and corrosion, and can also be used in gearboxes.

It comes in 5 L and 20 L packs.

Key properties

• Grade: SAE 20W-50, mineral preservation oil
• Additive chemistry equivalent to API SJ/CC
• Viscosity: 159 cSt at 40 °C, 18.7 at 100 °C, viscosity index 115
• Specific gravity 0.89 at 15 °C, pour point -23 °C, flash point 200 °C
• Vapour-phase inhibitors protect working surfaces against rust
• Resists draining away during long storage

Choosing the right oil

This is the right product for a car, bike or engine that will sit for months, for example over winter or during a restoration. Fill the engine with it as part of your lay-up routine and the vapour-phase inhibitors protect the working surfaces while the car is stored.

Millers Oils allows limited running: up to 2,000 quiet road miles during the running-in period, and it can be run in gearboxes that call for engine oil. In hypoid final drives it is suitable only for storage, not for service use.

Before taking a stored engine back into regular use, change to the engine oil that suits it. A preservation oil is not a replacement for the correct everyday grade, and an oil change is a good moment to check the filter and the sump.