10W-30 Oils
Our 10W-30 engine oils. Your handbook gives the grade and specification your engine needs.
Diesel Gard 10W-30 CI-4/SL
A shear stable, high-quality semi-synthetic engine oil designed for use in high-output, high-speed diesel engines.
Farmmaster 10W-30
A premium multi-functional lubricant specially formulated for agricultural equipment.
Q 10W-30 SN Plus
A mineral-based engine lubricant formulated using updated additive technology and high-quality virgin base oils.
What 10W-30 means
10W-30 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-30 flows more easily from cold than a 15W-30, and is thinner when hot than a 10W-40.
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.