SAE 15W-40
15W-40 is the long-standing heavy-duty diesel grade. Its 15W winter rating is higher than a 10W oil, so cold-start pumpability is lower, but it remains the grade most commercial diesel engines were specified around and it is widely used across mixed fleets.
- Cold-start rating
- 15
- High-temperature rating
- 40
Typical use
Commercial and heavy-duty diesel engines specified for 15W-40.
