Kroon Oil Classic Monograde 30

SAE 30 monograde mineral engine oil for post-war classic engines

Kroon-Oil Classic Monograde 30 is a mineral, single-grade SAE 30 engine oil for classic petrol and diesel engines.

It is listed to API SF/CC, CCMC G2/D1 and MIL-L-46152B/C, and is available in 1 L and 60 L packs.

Key properties

• Grade: SAE 30 monograde, mineral base oil
• Listed: API SF/CC, CCMC G2/D1, MIL-L-46152B/C, Ford M2C153-C and M2C9011-A, GM 6085M
• Viscosity: 103 mm²/s at 40 °C, 11.7 mm²/s at 100 °C, viscosity index 98
• Total base number 3.5 mg KOH/g, sulphated ash 0.55%
• Flash point (COC) 230 °C, pour point -18 °C
• Described as compatible with classic seals and rubbers

Choosing the right oil

Kroon-Oil says this oil is meant for post-war classic petrol and diesel engines without a turbo that call for a lightly to moderately detergent single-grade oil. If your engine's handbook asks for SAE 30 and the car is not turbocharged, this matches; if it asks for a multigrade, move to one of the Classic Multigrade oils in the same line.

A monograde is a straight-weight oil: it is sensible for engines that spend most of the year in warm weather or are run seasonally. For an engine that must start in frost, a multigrade will normally be easier on the starter.

The oil is described as not carrying a risk of loosening old deposits, which is relevant when you are switching an old, never-flushed engine.