Tesla will end its customer referral program on Feb. 1. because it’s costing the company too much money, chief executive Elon Musk said in a tweet on Thursday.

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The initiative allows customers to give their friends referral codes to get six months of free charging with the purchase of a Model S, Model X or Model 3, according to Tesla’s website. Participating drivers will then receive an award of their own, based on how many people they refer.

There will not be another referral system after this one ends, Musk said, because it’s “adding too much cost to the cars, especially Model 3.” Drivers must refer friends before Feb. 1 in order to qualify.

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