API SF Class
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Engine oils for petrol engines built from 1980 onward (obsolete class).
These engine oils were used in petrol engines of 1980-1989 model years, provided the engine manufacturer's recommendations and instructions allowed it. They offer stronger resistance to oxidation and better wear protection than the baseline properties of SE oils, as well as more reliable protection against deposits, rust and corrosion. SF-class engine oils could be used as substitutes for the earlier SE, SD, or SC classes.