77 Lubricants Motor Oil SL 15W-40

Worth knowing

The list of codes here is the same as for the line’s Motor Oil SL 10W-40, and most data sheet figures match or nearly match: 13.8 and 13.9 mm²/s at 100 °C, HTHS 3.9 mPa·s, base number 9.5 mg KOH/g, sulphated ash 1.1 %, pour point -36 °C. The oils differ in base oil and viscosity index: mineral against semi-synthetic, 152 against 161. The first number of the SAE grade is different too, and the data sheet gives cold-cranking (CCS) viscosity for the 15W-40 at -20 °C (3,380 mPa·s) but for the 10W-40 at -25 °C (4,510 mPa·s), so the two numbers cannot be compared directly. Each lies below the limit of its grade, 7,000 mPa·s according to the SAE table, and the pour point does not define the W grade.

The data sheets speak differently about the particulate filter. The 10W-40 expressly excludes diesels with such a filter, while the 15W-40 data sheet has no such sentence. That is not permission: the class is the same, ACEA A3/B3, from the full-ash A/B family for engines without a filter.