Apple Investing in Tesla Is a 'Poor Idea': Buffett

Despite calls for Apple Inc. (AAPL) to invest in green car maker Tesla Inc. (TSLA), Warren Buffett isn’t a fan of the proposal.

During an interview with Fox Business, the chief executive of Berkshire Hathaway and famed investor said that while he would support whatever Apple CEO Tim Cook did, he thinks it would “be a very poor idea to get in the auto business.”

Buffett, whose Berkshire owns a stake in Chinese electric vehicle company Byd Co. Ltd, said during the interview that the car business isn’t an easy one with lots of competition and ups and downs. “It does not give you a permanent advantage,” Buffett said of acquiring Tesla.

Buffet’s comments came on the same day he told CNBC he added to his stake in Apple since the end of June. (See more: Buffett Buys More Apple, Calls iPhone 'Enormously Underpriced'.)

Musk Should Have Self-Edited

As for Musk’s go-private Tweets, Buffett said he should have corrected himself after saying he secured funding for a deal if that wasn’t the case. “If you’ve got a stock that’s trading like crazy, you come on three minutes later and say, ‘I misspoke when I said funding secured. I really meant to say I think I can get funding,’” he said.

Tesla, Apple Can Benefit From Deal

At least one Wall Street watcher has been calling for Apple to help the car maker. Aside from Musk's erratic behavior, the company has been burning through its cash as it beefs up production of its Model 3 sedan, which had been plagued with production snafus.

Earlier this month, Ross Gerber, co-founder and CEO of Gerber Kawasaki, told CNBC that Apple investing in Tesla would benefit both sides. He made the comments on the heels of Musk’s go-private tweets. "In the past, Apple and Tesla probably wouldn't have gotten along because Musk didn't need Apple, but it is clear he needs help [now]," Gerber told CNBC. Apple also stands to benefit with Gerber arguing Tesla can help Apple gain ground in the car market and garner a potential lead over the long term. He pointed to Apple’s self-driving car project dubbed Project Titan, which he said hasn’t gone anywhere. Gerber thinks Apple should buy 5% to 10% of Tesla. (See more: Time's Running Short for Cash-Strapped Tesla: Canaccord.)