20W-50 Oils
Our 20W-50 engine oils. Your handbook gives the grade and specification your engine needs.
Fleetmaster 20W-50 CH-4
A mineral engine oil designed to lubricate and protect high-speed diesel engines.
Q 20W-50 SL
A mineral oil engine lubricant formulated using updated additive technology and high-quality virgin base oils.
What 20W-50 means
20W-50 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 20W-50 flows more easily from cold than a 25W-50, and is thinner when hot than a 20W-60.
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.