Kroon Oil Classic Multigrade 15W-40

Mineral 15W-40 multigrade for classic petrol and diesel engines

Kroon-Oil Classic Multigrade 15W-40 is a mineral SAE 15W-40 engine oil for classic petrol and diesel engines in passenger cars and light vans.

It is sold in 1 L tins and 60 L drums and is listed to API SF/CC and CCMC G2/D1.

Key properties

• Grade: SAE 15W-40, mineral base oil
• Listed: API SF/CC, CCMC G2/D1, Ford M2C153-C and M2C9011-A, GM 6041M / 6085M / 6136M
• Viscosity: 103.4 mm²/s at 40 °C, 14.0 mm²/s at 100 °C, viscosity index 137
• Cold viscosity 6,300 mPa.s at -20 °C
• Total base number 3.5 mg KOH/g, sulphated ash 0.86%
• Flash point (COC) 232 °C, pour point -30 °C

Choosing the right oil

15W-40 sits between the thinner 10W-30 and the thicker 20W-50 in this range. It is the natural choice when the handbook of a 1960s to early 1980s car names 15W-40, or when you are moving from a straight SAE 30 or 40 to a multigrade for easier winter starting.

If you are weighing 15W-40 against 20W-50, think about the engine rather than the oil: a tired engine with generous clearances and a tendency to lose oil pressure when hot often does better on the thicker grade, while an engine in good condition that asks for a lighter oil should not be forced onto a heavier one.

The product is described as not loosening old deposits, which helps when changing oil in an engine that has not been flushed.