SD

An API designation of oil for gasoline engines for 1968 to 1970 passenger cars and some trucks. This category may also apply to certain 1971 or later models as specified (or recommended) in the owner's manuals. Oils designed for this service provide more protection against high and low temperature deposits, wear, rust, and corrosion in gasoline engines than the SC oil it replaced. It was replaced, in turn, by SE classified oil. These vehicles can benefit from the modern SM oils.

SDC

1. Abbreviation for Semi-drop center rim.
2. Abbreviation for Systems Development Charge

SDI

Abbreviation for Saab Direct Ignition

SDL

Abbreviation for Service District for Lighting

SDM

Abbreviation for Sensing Diagnostic Module

SDV

1. Abbreviation for Spark delay valve
2. Abbreviation for Spark Deceleration Valve

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