400SEL (140.043) V8-4.2L (119.971) (1993)
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A 2-stage cap is fitted to model 210.
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2-stage cap must be screwed in sufficiently until the lug engages the notch at the coolant expansion reservoir.
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The cap has an additional pressure stage with the result that the system pressure may rise to 2 bar during the engine off heating phase without
coolant flowing out.