Yes my s320 maybe after 50 key on,will act funny.I have to insert key and hold in starting posistion for 10 seconds to start.After that no trouble till next 50 key on.
Been through 5 starters since November.Assuming it was starters.Could get a Bosch starter,they sent wrong starter.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt