10W-40 Oils
Our 10W-40 engine oils. Your handbook gives the grade and specification your engine needs.
Diesel Gard 10W-40 CK-4
A semi-synthetic low SAPS stay-in-grade high-performance diesel engine oil for normally aspirated, or turbocharged, highly rated diesel engines.
Hypergrade Plus 10W-40 SN Plus A3/B4
A semi-synthetic engine oil for use in gasoline and diesel vehicles.
QT Supreme 10W-40 SN/MA2
A semi-synthetic multi-grade engine oil, designed to meet the requirements of modern four-stroke motorcycle engines.
QT Supreme Scooter 10W-40 SL/MB
A semi-synthetic multi-grade engine oil, designed for performance, to meet the requirements of modern four-stroke scooter engines.
What 10W-40 means
10W-40 is an SAE viscosity grade. The first number, followed by W for winter, shows how easily the oil flows when cold: the lower the number, the faster it reaches the engine at start-up. The second number shows how thick the oil stays at normal running temperature: the higher the number, the thicker the oil.
So a 10W-40 flows more easily from cold than a 15W-40, and is thinner when hot than a 10W-50.
Use a grade your car's manufacturer lists, with the specification it asks for as well: oils of the same grade can meet different specifications.
More in our guide to what the numbers on engine oil mean.