Millers Classic Running In Oil 30

SAE 30 running-in oil for rebuilt classic engines

Millers Classic Running In Oil 30 is a mineral SAE 30 oil for the first running-in period of rebuilt vintage and classic engines. It is used undiluted.

It comes in 1 L, 5 L, 25 L and 60 L packs.

Key properties

• Grade: SAE 30, mineral base oil, developed to deliver API SE/CC performance
• Viscosity: 104 cSt at 40 °C, 11.9 cSt at 100 °C, viscosity index 103
• Density 0.887, pour point -15 °C, flash point above 200 °C
• TBN 6.7 mg KOH/g, ZDDP 765
• Protects the highly loaded parts of the valve train while piston rings bed in to the bore
• Suitable for roughly 500 miles of running-in

Choosing the right oil

Use this after an engine rebuild, when the piston rings need to bed in against freshly honed cylinder walls. Millers Oils describes a running-in period of about 500 miles, with the engine loaded at maximum torque during that time to help the rings bed in; follow your engine builder's own running-in procedure above any general guide.

Once the running-in is complete, drain the oil and refill with the classic engine oil recommended for your engine. The Millers Classic Pistoneeze and Classic Sport oils are examples of what to move to.

One warning from Millers Oils is worth repeating: fully synthetic and semi-synthetic oils should not be used before running-in is finished, because they can cause glazing of the cylinder bore.

It can be used on the road, on an engine test bed or on a rolling road.