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. Acronym for Semi-drop center rim.
2. Acronym for Systems Development Charge

SDI

Acronym for Saab Direct Ignition

SDL

Acronym for Service District for Lighting

SDM

Acronym for Sensing Diagnostic Module

SDV

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

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