Kroon Oil Classic Monograde 50

SAE 50 monograde mineral engine oil for hard-worked classic engines

Kroon-Oil Classic Monograde 50 is a mineral, single-grade SAE 50 engine oil for classic petrol and diesel engines.

It carries the same API SF/CC, CCMC G2/D1 and MIL-L-46152B/C listings as the rest of the Classic engine oil range, in 1 L and 60 L packs.

Key properties

• Grade: SAE 50 monograde, mineral base oil
• Listed: API SF/CC, CCMC G2/D1, MIL-L-46152B/C, Ford M2C153-C and M2C9011-A, GM 6085M
• Viscosity: 240 mm²/s at 40 °C, 18.8 mm²/s at 100 °C, viscosity index 96
• Total base number 3.5 mg KOH/g, acid number 2.25 mg KOH/g, sulphated ash 0.55%
• Flash point (COC) 258 °C, pour point -12 °C
• Compatible with classic seals and rubbers

Choosing the right oil

SAE 50 is the thickest engine grade in this line. It suits post-war classic engines whose handbook asks for a 50 weight oil, often engines with generous bearing clearances or ones that run hot. It is a poor choice for a modern or tight engine that asks for a thin oil.

With a pour point of -12 °C this is a warm-weather oil. If the car is used in winter, consider whether a multigrade such as Classic Multigrade 20W-50 is a better fit; a straight 50 is thick on a cold start.

The product is described as lightly to moderately detergent, with no risk of loosening old deposits, so it is suitable for switching engines that have not been cleaned inside.