Packed with luxuries and safety items, the 300s sat comfortably at the top of the new S-class range, with the SEL – four inches longer than the standard cars – roughly twice the price of the entry level 250S. The 300s came as standard with a four-speed automatic gearbox, later supplemented by an optional five-speed manual. All used the older
all-alloy three-litre straight-six, up until late 1968 when the SE was dropped and the 300SEL, rather confusingly for those starting to understand Mercedes models, got the 280SE’s 2.8-litre engine.
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Information from Octane Magazine.